Unit Three Cornell Notes B
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Unit Three Cornell Notes B






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Unit Three Cornell Notes B Presentation Transcript

  • 1. Heredity Unit: Cornell Notes Mr. Forde Black Team 2008
  • 2. Unit: Heredity Intro
    • The passing on of traits from an organism to its offspring
    • A characteristic that can be passed from a parent to their offspring through genes
    • The scientific study of heredity
    • A 19th century priest who studied pea plants and is the “father of genetics”
    Name: Date: Group:
    • What is heredity ?
    • What are traits ?
    • What is genetics ?
    • Who was Gregor Mendel ?
  • 3. Unit: Heredity Intro
    • A short section of a chromosome that contains information about a trait.
    • Each person has two genes for each trait because our chromosomes come in pairs!
    • 2) Humans have 23 pairs of chromosomes (46). Half come from Mom and half come from Dad.
    • 3) They can have more or less than humans!
    • Dog= 78
    • Human= 46
    • Cat = 38
    • Pea plant = 14
    Name: Date: Group:
    • What is a gene?
    • 2) How many chromosomes do we have?
    • 3) Do all living things have the same number of chromosomes?
  • 4. Unit: Heredity
    • Different forms of a gene.
    • (e.g. TT ot Tt for tallness in plants.)
    • 2) An allele whose trait always shows up when the allele is present.
    • 3) An allele that is covered up when the dominant allele is present.
    • 4) A hybrid has a mix of alleles for a trait. (e.g. Tt, Bb, and Gg)
    • An organisms genetic make-up, or allele combinations.
    • (e.g. Bb)
    • 6) An organisms physical appearance
    • (e.g. Brown eyes)
    Name: Date: Group:
    • What are alleles?
    • What is a dominant allele?
    • What is a recessive allele?
    • What is a hybrid?
    • What is an organisms Genotype?
    • What is an organisms Phenotype?
  • 5. Unit: Heredity
    • Used to show all of the possible outcomes of a genetic cross and to determine the probability of a particular outcome.
    • <--- in the Punnett Square to the left
    • WW = Homozygous dominant
    • 2/4 or 50%
    • Ww= Heterozygous
    • 2/4 or 50%
    • <there was no ww= Homozygous recessive or 0%>
    Name: Date: Group:
    • What is a Punnett Square?
  • 6. Unit: Heredity
    • (Deoxyribonucleic Acid) stores and passes on genetic information from one generation to the next.
    • DNA looks like a twisted ladder or spiral staircase.
    • The steps of the ladder are made up of nitrogen bases.
    • Adenine (A) pairs with Thymine (T)
    • Cytosine <C> pairs with Guanine <G>
    • 3) The order of the letters of the bases makes up the code.
    Name: Date: Group:
    • What is DNA?
    • How is DNA Structured?
    • What is the genetic code?
  • 7. Unit: Heredity Name: Date: Group:
    • What is REPLICATION?
  • 8. Unit: Heredity
    • A picture of the size, shape and number of chromosomes of an organism.
    • (Chromosome pairs look alike.)
    • 2) The removal of a small amount of fluid around a developing baby, which contains the baby’s cells, in order to examine the chromosomes of the baby.
    • 3) When a chromosome pair does not separate properly during meiosis.
    • This results in a cell being formed with more or less chromosomes than normal.
    Name: Date: Group:
    • What is a karyotype?
    • What is an amniocentesis?
    • What is non-disjunction?
  • 9. Unit: Heredity
    • Gametes are sex cells. The egg cell and sperm cell are gametes.
    • 2) This is so the gametes will have 1/2 the amount of DNA when they combine to form the zygote.
    • 3) A zygote is a fertilized egg.
    • 4) A somatic cell is a body cell. It has a full set (46) of chromosomes. Al l cells that are not gametes are considered somatic cells.
    • 5) This is what happens in sexual reproduction due to the mix of chromosomes from a male and female combining. A unique combination is formed.
    Name: Date: Group:
    • What are gametes?
    • Why are gametes produced through meiosis?
    • What is a zygote?
    • 4) What is a somatic cell?
    • 5) What is genetic variability?