1. Mutations can occur at the gene or chromosomal level and can be caused by errors in DNA replication or exposure to mutagens like radiation or chemicals.
2. Gene mutations include substitutions, insertions, and deletions of DNA bases and can range from having little to no effect to causing genetic disorders, depending on where they occur.
3. Chromosomal mutations involve changes in chromosome structure or number, such as deletions, inversions, duplications, and translocations, and can also cause genetic disorders.
Examples of Codominance. The best example, in this case, is the codominance blood type. ABO group is considered to be a codominant blood group where both father’s and mother’s blood group is expressed. It means that the properties of the blood groups exist in the ABO type.
Codominance is a relationship between two versions of a gene. Individuals receive one version of a gene, called an allele, from each parent. If the alleles are different, the dominant allele usually will be expressed, while the effect of the other allele, called recessive, is masked.
Chapter 15: Chromosomal Basis of InheritanceAngel Vega
KEY CONCEPTS
15.1 Morgan showed that Mendelian inheritance has its physical
basis in the behavior of chromosomes: Scientific inquiry
15.2 Sex-linked genes exhibit unique patterns of inheritance
15.3 Linked genes tend to be inherited together because they are located near each other on the same chromosome
15.4 Alterations of chromosome number or structure cause
some genetic disorders
15.5 Some inheritance patterns are exceptions to standard
Mendelian inheritance
Alterations in the DNA code, such as changing a letter, deleting a letter, inserting a letter or moving sections aroun proteins with abnormal functions.
If these abnormal functions cause the cell to grow, divide, ignore regulatory signals or assume new functions, cancers can develop
Fortunately, normal cells are good at repairing mistakes should they occur and have multiple systems for ensuring that the DNA co transmitted to its two daughter cells when it divides. Normal cells even have suicide programs if the mistakes are beyond repair, a p death, known as apoptosis. [Source: https://www.loxooncology.com/genomically-defined-cancers/genomic-alterations]
Examples of Codominance. The best example, in this case, is the codominance blood type. ABO group is considered to be a codominant blood group where both father’s and mother’s blood group is expressed. It means that the properties of the blood groups exist in the ABO type.
Codominance is a relationship between two versions of a gene. Individuals receive one version of a gene, called an allele, from each parent. If the alleles are different, the dominant allele usually will be expressed, while the effect of the other allele, called recessive, is masked.
Chapter 15: Chromosomal Basis of InheritanceAngel Vega
KEY CONCEPTS
15.1 Morgan showed that Mendelian inheritance has its physical
basis in the behavior of chromosomes: Scientific inquiry
15.2 Sex-linked genes exhibit unique patterns of inheritance
15.3 Linked genes tend to be inherited together because they are located near each other on the same chromosome
15.4 Alterations of chromosome number or structure cause
some genetic disorders
15.5 Some inheritance patterns are exceptions to standard
Mendelian inheritance
Alterations in the DNA code, such as changing a letter, deleting a letter, inserting a letter or moving sections aroun proteins with abnormal functions.
If these abnormal functions cause the cell to grow, divide, ignore regulatory signals or assume new functions, cancers can develop
Fortunately, normal cells are good at repairing mistakes should they occur and have multiple systems for ensuring that the DNA co transmitted to its two daughter cells when it divides. Normal cells even have suicide programs if the mistakes are beyond repair, a p death, known as apoptosis. [Source: https://www.loxooncology.com/genomically-defined-cancers/genomic-alterations]
mutations Is a process that produces a gene or chromosome that differs from the wild type.
The mutation may result due to changes either on the gene or the chromosome itself.
This presentation will help students to brush up their basic concepts and along with that it will help them to understand what are mutations and what are its causes.
An overview on mutation, the general mechanisms, classification based on various characteristics, analogy sentence and genetic disorder of various types based on its classification, a brief description of mutagens agents and consequences of mutation in our body and on other living creatures
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Personal development courses are widely available today, with each one promising life-changing outcomes. Tim Han’s Life Mastery Achievers (LMA) Course has drawn a lot of interest. In addition to offering my frank assessment of Success Insider’s LMA Course, this piece examines the course’s effects via a variety of Tim Han LMA course reviews and Success Insider comments.
June 3, 2024 Anti-Semitism Letter Sent to MIT President Kornbluth and MIT Cor...Levi Shapiro
Letter from the Congress of the United States regarding Anti-Semitism sent June 3rd to MIT President Sally Kornbluth, MIT Corp Chair, Mark Gorenberg
Dear Dr. Kornbluth and Mr. Gorenberg,
The US House of Representatives is deeply concerned by ongoing and pervasive acts of antisemitic
harassment and intimidation at the Massachusetts Institute of Technology (MIT). Failing to act decisively to ensure a safe learning environment for all students would be a grave dereliction of your responsibilities as President of MIT and Chair of the MIT Corporation.
This Congress will not stand idly by and allow an environment hostile to Jewish students to persist. The House believes that your institution is in violation of Title VI of the Civil Rights Act, and the inability or
unwillingness to rectify this violation through action requires accountability.
Postsecondary education is a unique opportunity for students to learn and have their ideas and beliefs challenged. However, universities receiving hundreds of millions of federal funds annually have denied
students that opportunity and have been hijacked to become venues for the promotion of terrorism, antisemitic harassment and intimidation, unlawful encampments, and in some cases, assaults and riots.
The House of Representatives will not countenance the use of federal funds to indoctrinate students into hateful, antisemitic, anti-American supporters of terrorism. Investigations into campus antisemitism by the Committee on Education and the Workforce and the Committee on Ways and Means have been expanded into a Congress-wide probe across all relevant jurisdictions to address this national crisis. The undersigned Committees will conduct oversight into the use of federal funds at MIT and its learning environment under authorities granted to each Committee.
• The Committee on Education and the Workforce has been investigating your institution since December 7, 2023. The Committee has broad jurisdiction over postsecondary education, including its compliance with Title VI of the Civil Rights Act, campus safety concerns over disruptions to the learning environment, and the awarding of federal student aid under the Higher Education Act.
• The Committee on Oversight and Accountability is investigating the sources of funding and other support flowing to groups espousing pro-Hamas propaganda and engaged in antisemitic harassment and intimidation of students. The Committee on Oversight and Accountability is the principal oversight committee of the US House of Representatives and has broad authority to investigate “any matter” at “any time” under House Rule X.
• The Committee on Ways and Means has been investigating several universities since November 15, 2023, when the Committee held a hearing entitled From Ivory Towers to Dark Corners: Investigating the Nexus Between Antisemitism, Tax-Exempt Universities, and Terror Financing. The Committee followed the hearing with letters to those institutions on January 10, 202
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Artificial Intelligence (AI) technologies such as Generative AI, Image Generators and Large Language Models have had a dramatic impact on teaching, learning and assessment over the past 18 months. The most immediate threat AI posed was to Academic Integrity with Higher Education Institutes (HEIs) focusing their efforts on combating the use of GenAI in assessment. Guidelines were developed for staff and students, policies put in place too. Innovative educators have forged paths in the use of Generative AI for teaching, learning and assessments leading to pockets of transformation springing up across HEIs, often with little or no top-down guidance, support or direction.
This Gasta posits a strategic approach to integrating AI into HEIs to prepare staff, students and the curriculum for an evolving world and workplace. We will highlight the advantages of working with these technologies beyond the realm of teaching, learning and assessment by considering prompt engineering skills, industry impact, curriculum changes, and the need for staff upskilling. In contrast, not engaging strategically with Generative AI poses risks, including falling behind peers, missed opportunities and failing to ensure our graduates remain employable. The rapid evolution of AI technologies necessitates a proactive and strategic approach if we are to remain relevant.
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http://sandymillin.wordpress.com/iateflwebinar2024
Published classroom materials form the basis of syllabuses, drive teacher professional development, and have a potentially huge influence on learners, teachers and education systems. All teachers also create their own materials, whether a few sentences on a blackboard, a highly-structured fully-realised online course, or anything in between. Despite this, the knowledge and skills needed to create effective language learning materials are rarely part of teacher training, and are mostly learnt by trial and error.
Knowledge and skills frameworks, generally called competency frameworks, for ELT teachers, trainers and managers have existed for a few years now. However, until I created one for my MA dissertation, there wasn’t one drawing together what we need to know and do to be able to effectively produce language learning materials.
This webinar will introduce you to my framework, highlighting the key competencies I identified from my research. It will also show how anybody involved in language teaching (any language, not just English!), teacher training, managing schools or developing language learning materials can benefit from using the framework.
The French Revolution, which began in 1789, was a period of radical social and political upheaval in France. It marked the decline of absolute monarchies, the rise of secular and democratic republics, and the eventual rise of Napoleon Bonaparte. This revolutionary period is crucial in understanding the transition from feudalism to modernity in Europe.
For more information, visit-www.vavaclasses.com
2. Genetic Factor that cause variation
GENETIC
MUTATION
SEXUAL
REPRODUCTION
CHROMOSOMAL MUTATION GENE MUTATION
INDEPENDENT
ASSORTMENT
CROSSING
OVER
RANDOM
FERTILISATION
duplication
inversion
translocation
deletion
deletion
insertion
substitution
3. MUTATION
• Mutation: the spontaneous change to the
structure of genes or chromosomes
• Resulting in irreversible & permanent change in
the organism
4. a. Mutation can involve the ENTIRE chromosome
or a SINGLE gene
b. May HELP, HARM, or have LITTLE to no effect
on future generations
o Changes may be SILENT or may cause
phenotypic changes
7. The causes of mutations
1. DNA fails to copy accurately:-
When a cell divides, it makes a copy of its DNA — and
sometimes the copy is not quite perfect. That small
difference from the original DNA sequence is a mutation.
8. High energy ionising radiation
- X-rays, gamma rays, ultraviolet
rays.
Chemical mutagens -
benzene, asbestos, formaldehyde,
pesticide, mustard gas, tar in
tobacco smoke
2. Chemicals / Radiation
These agents cause the DNA to break down.
Mutagens = agents that cause mutation
11. Eg of Diseases Caused by Gene
Mutation
Sickle cell Anemia
Polydactylism
Albinism
12. Colour blindness
Mutant gene (recessive gene)
on the X chromosome.
•Not able to differentiate
colours especially green and
red
•More common in males
because male has only one X
chromosome
13. Albinism
The gene for skin colour is
mutated (recessive gene)
•Unable to produce melanin
(black pigment)
•White hair
•Pink eyes and pinkish skin
•Skin is sensitive to sunlight
14. Albinism is caused by an alteration of the
gene that makes the pigment melanin.
ALBINISM not limited to humans
15. Sickle-cell anemia
Mutation in gene that
produce haemoglobin
•Sickle-cell shaped red blood
cells
•Not efficient in transporting
oxygen
•Yellowing of eyes
16. Haemophilia
Mutation in chromosome X
(for blood clotting)
• Have problem in blood
clotting
• May bleed continuously or
for a longer period
• A woman carrier may pass
the disease to a son
17. DNA
4 nucleotide bases:
A, T, G, C.
(adenine, thymine,
guanine, and cytosine. )
The sequence of these
bases encodes instructions
to make amino acids.
18. Sets of three bases that specify
an amino acid - codon
The amino acid that corresponds
to "GCA" - Alanine
20 different amino acids are
synthesized in humans.
19. Gene Mutations
3 types:
1. Base Substitution
2. Base Deletion
3. Base Insertion
Changes in the structure of DNA
20. 1. Base substitution
one base is replaced by
another.
ATT/CGC/TTA ATG/CGC/TTA
Only affects a single amino acid.
Little effect unless active site of an
enzyme is affected.
Eg. sickle-cell anemia (caused by
a single amino acid substitution)
21. Analogy
3 letter words because codons are 3 letters
The cat ate the rat.
SUBSTITUTION
Thc cat ate the rat.
May have little effect. You still have the idea like a
typo on a test.
The hat ate the rat.
Changes the thought of the sentence.
The effect depends on where the substitution happens
22. Sickle Cell Hemoglobin
GUG CAC CUG ACU CCU GAG GAG AAG
val his leu thr pro glu glu lys
1 2 3 4 5 6 7 8
GUG CAC CUG ACU CCU GUG GAG AAG
val his leu thr pro val glu lys
1 2 3 4 5 6 7 8
Mutation
(in DNA)
Normal mRNA
Normal protein
Mutant mRNA
Mutant protein
Glutamate (glu), a negatively charged amino acid,
is replaced by valine (val), which has no charge.
24. 2. Base Insertion
Base insertion means a single base
is added.
This will affect all subsequent
amino acids in that protein and the
effects are therefore likely to be
severe
ATT/CCT/GTC ATG/TCC/TGT/C
G
25. Normal DNA: CGA – TGC – ATC
Base Insertion
Mutated DNA: CGA – TAG – CAT – C
Alanine – Threonine – stop
Alanine – Isoleucine – Valine
An adenine was inserted
thereby pushing all the
other bases over a frame.
26. Analogy
Insertion
The cat ate the rat.
The cca tat eth era t.
Inserting the c causes a
FRAMESHIFT
THE SENTENCE NO LONGER
MAKES SENSE!! Insertions may have
huge effects.
27. Gene Mutations
Huntington’s Disease is caused by
an insertion mutation.
People with this
disorder have
involuntary movement
and loss of motor
control. They
eventually have
memory loss and
dementia. The
disease is terminal.
Huntington Disease
Located on chromosome 4
First Gene Disease Mapped
28. 3. Base Deletion
Base deletion means a single base
is omitted.
This will affect all subsequent
amino acids in that protein and the
effects are therefore likely to be
severe
ATT/CCT/GTC ATT/CTG/TC
29. Mutated DNA: CGA – TCA- TC
A guanine was deleted,
thereby pushing all the
bases down a frame.
Alanine – Threonine – stop
Alanine – Serine
Base Deletion
Normal DNA: CGA – TGC – ATC
30. Analogy
DELETION
The cat ate the rat.
Thc ata tet her at
FRAMESHIFT
The sentence no longer makes
sense!! Deletions can have huge
effects.
44. 1. Alterations in chromosome number.
Euploid - normal set (2n)
Polyploidy-extra set of the entire genome(3n, 4n etc)
(duplication of the entire set of chromosomes)
Aneuploidy – the number of chromosomes is not
a multiple of the normal haploid number.
(a) Monosomy - one member of a chromosome
pair is missing (2n-1)
(b) Trisomy - one chromosome set consists
of 3 copies of a chromosome
(2n+1)
Chromosomal abnormalities
45. Occasionally, there is an accident
during Meiosis 1 or Meiosis 2 called
nondisjunction:
How Accidents During Meiosis Can
Alter Chromosome Number
– The members of a chromosome pair fail to
separate during anaphase I or II
– Gametes with an incorrect number of
chromosomes are produced
46. Meiosis I
Nondisjunction
n + 1 n + 1 n - 1 n - 1 n + 1 n - 1 n n
Number of chromosomes
Gametes
Nondisjunction
Meiosis II
(a) Nondisjunction in meiosis I (b) Nondisjunction in meiosis II
NONDISJUNCTION IN MEIOSIS I / MEIOSIS II
47. The result of nondisjunction
Figure 8.22
Egg
cell
n (normal)
Zygote
2n + 1
n + 1
Sperm
cell
Upon Fertilisation
48.
49. Down Syndrome: An Extra Chromosome 21
–Is also called trisomy 21
Figure 8.19
57. Turner Syndrome (44 + XO)
Constriction
of aorta
(b) A woman with Turner
syndrome (XO)
Poor breast
development
Web of
skin
Under-developed
ovaries
•Infertile , Short, Mentally retarded
•Has no ovaries, Small breasts
•Folded skin on neck
•No menstrual cycle
59. Environmental Factors That
cause Variation
Climate
Diet
Physical accidents
Temperature
pH
Humidity
Light intensity
Soil fertility
Culture
Lifestyle
PHENOTYPE = GENOTYPE + EFFECTS OF
ENVIRONMENT
60.
61.
62.
63.
64.
65.
66. The Importance of Variation in
the Survival of A Spesies
Provide necessary adaptation to
help a species survive in an ever
changing environment
Can withstand severe weather
Become more resistant to pests
and diseases.
67. Interactions between environmental factors and
genetic factors
Dark & grey moths
– Biston betularia in England
Unpolluted environment, lichen
covered tree trunks
- Dark moths not camouflaged.
More easily detected & eaten
by predators.
Dark moth population
decreased.
- Grey moth population
68. Industrial Revolution
- pollution, soot on trees, lichen
killed
- Dark moths camouflaged. Dark
moth population increased
- Grey moth population
decreased (more obvious to
predator)
1960, Clean Air Act- air quality
improved.
- Dark moth population decreased
because again more obvious to
predator.
- Grey moth population increased.
70. Polyploidy
– The number of chromosomes is increased by one
or more sets.
– More common in plants.
71. Searching for Chromosomal Defects - Amniocentesis and Chorionic
Villus Sampling
Many new
techniques for
learning about
individual genes
rather than whole
chromosomes are
available or under
development.
72. Searching for Chromosome and Gene Defects – Pre-Implantation
Genetic Diagnosis (PGD)
Removing a cell for
diagnosis from a human
embryo.
The diagnosis: trisomy
21 (Down syndrome).
73. loss of a chromosomal segment
extra copy of a chromosomal
segment
order of a chromosome
segment has been reversed
chromosomal segment transferred
from one chromosome
to another
Editor's Notes
High energy ionising radiation.- (Enter body cells and change structures of genes & chromosomes)
Chemical mutagens - (Can damage DNA, causing genetic disorders)
Ask students if they can figure out what is happening in this mutation.
Answer is on the next slide.
A genetic marker linked to Huntington disease was found on chromosome 4 in 1983, making Huntington disease, or HD, the first genetic disease mapped using DNA polymorphisms. HD is inherited as an autosomal dominant disease.
Ask students if they can figure out what is happening in this mutation.
Answer is on the next slide.
When chromosome 7 loses an end piece, the result is Williams syndrome. These children, although unrelated, have the same appearance, health, and behavioral problems. Children with this syndrome look like pixies because they have turned-up noses, wide mouths, a small chin, and large ears. Although their academic skills are poor, they exhibit excellent verbal and musical abilities.
This karyotype shows an individual (male) with Down syndrome having an extra chromosome 21.