This document provides questions and answers about genetics and natural selection concepts. It includes definitions of genotype and phenotype. It discusses mitosis, chromosomes, karyotypes, human chromosome number, sex chromosomes, gene inheritance, incomplete vs codominance, a genetics problem about cat coat colors, blood types, natural selection, and examples of mutation advantages and disadvantages.
Molecular genetic analysis and ecological evidence on thynnine waspsNurfarah Ain
Its specific title: MOLECULAR GENETIC ANALYSIS AND ECOLOGICAL EVIDENCE REVEALS MULTIPLE CRYPTIC SPECIES AMONG THYNNINE WASP POLLINATORS OF SEXUALLY DECEPTIVE ORCHIDS
Heredity and evolution class 10th Questionssinghaniya12
Ncert chapter heredity and evolution class X you can find questions for exam preparation and there is lot of questions based on heredity and evolution chapter for it is doc file it contain short or long answer type question and it is like question paper of school
Bio380 Human Evolution: Waking the deadMark Pallen
Bio380 Human Evolution, genes and genomes lecture on contribution of archaic populations to gene pool of anatomically modern humans, including Neanderthals and Denisovan
Molecular genetic analysis and ecological evidence on thynnine waspsNurfarah Ain
Its specific title: MOLECULAR GENETIC ANALYSIS AND ECOLOGICAL EVIDENCE REVEALS MULTIPLE CRYPTIC SPECIES AMONG THYNNINE WASP POLLINATORS OF SEXUALLY DECEPTIVE ORCHIDS
Heredity and evolution class 10th Questionssinghaniya12
Ncert chapter heredity and evolution class X you can find questions for exam preparation and there is lot of questions based on heredity and evolution chapter for it is doc file it contain short or long answer type question and it is like question paper of school
Bio380 Human Evolution: Waking the deadMark Pallen
Bio380 Human Evolution, genes and genomes lecture on contribution of archaic populations to gene pool of anatomically modern humans, including Neanderthals and Denisovan
My first lecture on the second year Bio263 module on human evolution. An overview of human evolution and palaeoanthropology. Taxonomy and humanity's place in nature. Who is our closest living relative? Evidence from morphology and molecules.
See also Slidecast on YouTube
http://www.youtube.com/watch?v=28bLQIGRbWU
Lesson 2 of an A Level teaching resource, produced in conjunction with the Charles Darwin Trust, that uses Darwin's work on pigeon breeding and the work of contemporary scientists to explore genetics and evolution.
This second lesson covers the topic of genetics.
The accompanying teacher's notes can be found on our website at www.linnean.org/funkypigeons
A complementation test (sometimes called a "cis-trans" test) can be used to test whether the mutations in two strains are in different genes. By taking an example of Benzer's work, complementation has been explained.
My first lecture on the second year Bio263 module on human evolution. An overview of human evolution and palaeoanthropology. Taxonomy and humanity's place in nature. Who is our closest living relative? Evidence from morphology and molecules.
See also Slidecast on YouTube
http://www.youtube.com/watch?v=28bLQIGRbWU
Lesson 2 of an A Level teaching resource, produced in conjunction with the Charles Darwin Trust, that uses Darwin's work on pigeon breeding and the work of contemporary scientists to explore genetics and evolution.
This second lesson covers the topic of genetics.
The accompanying teacher's notes can be found on our website at www.linnean.org/funkypigeons
A complementation test (sometimes called a "cis-trans" test) can be used to test whether the mutations in two strains are in different genes. By taking an example of Benzer's work, complementation has been explained.
12). Choose the letter designation that represent homozygous recessi.pdfarasanlethers
12). Choose the letter designation that represent homozygous recessive genotypte?
c. ee
As there are always two letters in the genotype because one code for the trait come from materal
and other code for the trait comes from paternal oraganism, so every organism has two codes (
letters ). The two lowercase letters in the genotype referred as homozygous recessive genotype(
ee). The term pure may also used in place of homozygous.
13). Daughter nuclei form from each parent cell during
a. Telophase I and telophase II
In both at each pole, a daughter nucleus with nuclear membrane( from ER) and nucleolus( from
SAT chromosome) is formedand also there is disappearance of astral rays and spindle fibres.
14). The diploid human cell has _ chromosomes.
- 46
The diploid number is abbreviated as 2n because of the presence of twice the amount of
chromosomes as a haploid cell. The haploid cell has a total of 23 chromosomes while the diploid
cell has 46 chromosomes.
15). Choose all that are true about genes
- genes are located on chromosomes
- genes are units of inheritence about heritable trait
- genes are arranged in a linear sequence on a chromosome
- each gene has its own location,in one type of chromosome
16).Mendal theory of independent assortment states that
a. genes for different traits are randomly distributed to gametes during meiosis.
17). Pairs of homologus chromosomes exist
a. during meiosis I
It is a special type of division in which chromosomes duplicate only once, but cell divides twice.
So one parental cell produces 4 daughter cells.
18). Alternate forms of genes are called_
- alleles
19). The physical appearance of an individual is referrred to as its
b. Phenotype
20). The genetic make- up of an individual is referred to as its
a.Genotype
21). Why the sexual reproduction benefit for the organism?
all of these are true.
22). The various forms of particular gene are called
b. alleles
Solution
12). Choose the letter designation that represent homozygous recessive genotypte?
c. ee
As there are always two letters in the genotype because one code for the trait come from materal
and other code for the trait comes from paternal oraganism, so every organism has two codes (
letters ). The two lowercase letters in the genotype referred as homozygous recessive genotype(
ee). The term pure may also used in place of homozygous.
13). Daughter nuclei form from each parent cell during
a. Telophase I and telophase II
In both at each pole, a daughter nucleus with nuclear membrane( from ER) and nucleolus( from
SAT chromosome) is formedand also there is disappearance of astral rays and spindle fibres.
14). The diploid human cell has _ chromosomes.
- 46
The diploid number is abbreviated as 2n because of the presence of twice the amount of
chromosomes as a haploid cell. The haploid cell has a total of 23 chromosomes while the diploid
cell has 46 chromosomes.
15). Choose all that are true about genes
- genes are located on chromosomes
- genes are units of inheriten.
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Revision sheet genetics answered blog
1. Genetic website references
http://www.genetics.edu.au/Information/glossary-1
http://learn.genetics.utah.edu/
Remember to overview Natural selection – use you notes and material given in class.
1) What is a genotype?
Genotype is the combination of alleles (genes) that make up the gene – represented in letters.
i.e. LL, Ll (lL), ll
/2
2) What is a phenotype?
Phenotype is the physical characteristic of the gene i.e. attached lobe
/2
3) What is mitosis?
Mitosis is the process of one cell splitting into 2 cells.
/2
4) What is a chromosome? Where can chromosomes usually be found?
A chromosome consists of a long DNA stand tightly coiled over and over itself, forming a
chromosome. Chromosomes are usually found inside the nucleus.
/2
5) A karyotype?
A Is the number and appearance of B Is the physical appearance of a
chromosomes particular gene
C Is the result of two dominate genes D A typewriter that is carried on a
mixed together camel’s back.
/2
6) How many chromosomes do humans typically have?
A 22 B 44
C 23 D 46
/2
7) What sex chromosomes will a female have? Male?
A female will consist of 2 X chromosomes. A male will consist of an X and Y chromosome
2. 8) How are genes passed on through offspring?
Genes are passed on through DNA. ½ from the mother and ½ from the father
/2
9) What is the difference between incomplete dominance and co-dominance conditions?
Incomplete dominance is a blend of both inherited genes, whilst co-dominance will show both
inherited genes that is not a blend.
(Incomplete dominance is a condition when neither allele inherited is dominant or recessive over
the other. i.e. A red and a white flower will produce a pink flower
Co-Dominance is when both alleles contribute to the phenotype of an organism. I.e. a black and a
white chicken’s offspring will produce a white and black spotted/speckled chicken.)
/2
Far away on another planet a purple cat mated with a red cat and was due to have 8 kittens. Upon
examining the genetic makeup and breeding history of the cats, the colour allele was determined;
Purple allele are dominate, Red allele are recessive.
10) Figure out the ratios of the possible off springs genotypes and phenotypes
Note: as red is recessive, its genotype will be rr (r representing red – lower case as its recessive).
As Purple is a dominant allele the genotype of a purple cat can be PP or Pr (P representing purple
– capital as it represents dominant).
P P P r
r Pr Pr r Pr rr
r Pr Pr r Pr rr
Ratio of offspring if the purple cat is Pr –
1:1, genotype Pr : rr, phenotype purple : red respectively
Ratio of offspring if Purple cat is PP-
All cats will be purple and have a genotype of Pr
11) Is it possible for all offspring to be purple? Why or why not?
Yes only is the purple cats genotype is PP, a purebred. As the red cat will have a genotype of rr,
when mating the offspring will receive one gene from each parent hence all off spring will be Pr. As
P (purple) is dominate all offspring will be purple.
3. 12) Complete the table below
Human Blood Types
Phenotype Genotype
A AA or Ao
B BB or Bo
AB AB
o oo
13) Write a description regarding natural selection
Individuals with favourable characteristics for the environment are said to be better
adapted to the environment. Individuals with unfavourable characteristics for the
environment will usually die off/before they are able to reproduce
/2
14) Give a brief scenario where mutation for a living object is an advantage and another
scenario where it is a disadvantage?
A mouse mutates and has razor sharp poison spikes that can spring up along its back.
This would be an advantage, as it serves as a defensive mechanism when birds capture
mice causing the bird to release to mouse and it has a higher chance to survive.
A Mouse living in a rainforest mutates and 3 legs causing it to move slower. This would be
a disadvantage as it will not be able to flee or out manoeuvre its prey.
/2
15) Two colour types of frogs exist in the world Millions of years ago.
One type Green and the other Earth in colour.
Which frog would be more likely to be found in the outback? Why?
Which frog would exist in the forest? Why?
If all the forests died which frog would survive? Why?
The earth colour frog would more likely be found in the outback as its colour would blend
into its environment giving it a higher chance of survival and reproducing.
The green colour frog would be more probable to exist in the forest due to its colour
blending into its environment. However the earth colour may exist in there to.
The earth colour frog would most likely survive if all the forests died as its colour will help it
blend into the environment. However would anything exist without trees and forests?