Aim how do organisms inherit genetic information from their parents
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AIM: How do organisms inherit genetic information from their parents?. 4/16/13 DO NOW: 1. Pick up today’s quiz. HOMEWORK: ILS Review Book Read p. 23-25 Answer Questions #1-19 on p. 27-33 in your review book. DUE- Tomorrow. What are genes? Contains hereditary information

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Aim how do organisms inherit genetic information from their parents
AIM: How do organisms inherit genetic information from their parents?

4/16/13

DO NOW:

1. Pick up today’s quiz

HOMEWORK:

ILS Review Book

  • Read p. 23-25

  • Answer Questions #1-19 on p. 27-33 in your review book.

    DUE- Tomorrow


Aim how do organisms inherit genetic information from their parents

What are genes? their parents?

  • Contains hereditary information

  • Composed of DNA

    What determines your traits?

  • One or many pairs of your genes.

    Where do you inherit you traits from?

  • Mom & Dad


Aim how do organisms inherit genetic information from their parents

How does sexual reproduction differ from asexual reproduction?

  • Sexual – Combination of genes (traits) from sperm & egg.

  • Asexual – exact copy of the genes (traits) from the parent cell.


Aim how do organisms inherit genetic information from their parents

What is a dominant trait? reproduction?

  • A trait that hides (overshadows) the affect of another

    What is a recessive trait?

  • A trait whose affect may be hidden by a dominant trait.

    How do geneticists indicate whether a trait is dominant or recessive?

  • Dominant = Capital Letter “G”

  • Recessive = Lowercase letter “g”


Aim how do organisms inherit genetic information from their parents

How do geneticists represent the genes for a particular trait?

  • Genotype: GG, Gg, gg

  • One gene from mom & one from dad

    How do homozygous genes differ from heterozygous genes?

  • Homozygous = Pure (GG, gg)

  • Heterozygous = Hybrid (Gg)


Aim how do organisms inherit genetic information from their parents

What is phenotype? trait?

  • The observable trait as a result of the gene combination

    What are the phenotype of the following?

    G= Green pods

    g= Yellow pods

    GG =

    Green pods

    Gg =

    Green pods

    gg=

    Yellow pods


Aim how do organisms inherit genetic information from their parents

How can we predict the probability of a trait being expressed?

  • Punnett squares

  • Pedigree charts

    According to the punnett square at left, what is the probability of Green Pods? Yellow Pods?

  • Green = 3/4 or 75%

  • Yellow = 1/4 or 25%


Aim how do organisms inherit genetic information from their parents

A expressed?Punnett square is shown at right. The dominant trait is represented by R. The recessive trait is represented by r.

What percentage of the offspring will most likely show the dominant trait?

75% Dominant

25% Recessive


Aim how do organisms inherit genetic information from their parents

What is the probability of offspring with the tongue roller trait? Mom = Rr Dad= rr

Mom = Rr

Dad = Rr


Aim how do organisms inherit genetic information from their parents

How are males represented in a pedigree chart? trait? Mom =

  • Males = Squares

    How are females represented in a pedigree chart?

  • Females = circles

    How can you determine the offspring from a couple?