Genetics STAAR Review

The cross between two individuals with the genotype SsRr is shown in the Punnett square.

How many out of 16 offspring would be expected to be homozygous recessive for both traits?

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NGSS.HS-LS3-3

In Holstein cattle the allele for black hair color (B) is dominant over the allele for red hair color (b), and the allele for polled (P), or lacking horns, is dominant over the allele for having horns (p). What is the expected phenotypic ratio of the offspring of a BbPp × BbPp cross if these alleles sort independently?

• 16 black/polled :

  0 black/horned :

  0 red/polled :

  0 red/horned

• 12 black/polled :

  0 black/horned :

  0 red/polled :

  4 red/horned

• 4 black/polled :

  4 black/horned :

  4 red/polled :

  4 red/horned

• 9 black/polled :

  3 black/horned :

  3 red/polled :

  1 red/horned

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In humans blood type is determined by the A, B, and O alleles. The A and B alleles are codominant to each other and dominant over the O allele. An individual with the AO genotype and an individual with the BO genotype can produce offspring with which of the following phenotypes?

• O only

• A or B only

• A, B, or O only

• A, B, AB, or O

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Scientific study of heredity

• Genetics

• Heredity

• Anatomy

• Biology

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Who is the Father of Genetics?

• Robert Hooke

• Gregor Mendel

• Albert Einsten

• Albert Wegener

The "Father of Modern Genetics"

• Albert Einstein

• Gregor Mendel

• Rudolph Virchow

• Sir Isaac Newton

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The scientific study of heredity.

• Biology

• Gene Therapy

• Genetic Counseling

• Genetics

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Genetics is the study of ______________

• DNA

• heredity

• genes

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The father of genetics.

• Mendel

• Kodak Black

• Napolean

• EM Tiffany

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What is the probability of having heterozygous offspring?

• 25%

• 50%

• 0%

• 100%

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