AP Biology - Unit 5: Genetics Review

A couple has six children, all daughters. If the woman has a seventh child, what is the probability that the seventh child will be a daughter?

• 6/7

• 1/7

• 1/36

• 1/2

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NGSS.HS-LS3-3

In llamas, coat color is controlled by a gene that exists in two allelic forms. If a homozygous yellows llama is crossed with a homozygous brown llama, the offspring have gray coats. It two of the gray-coated offspring were crossed, what percentage of their offspring would have brown coats?

• 0%

• 25%

• 50%

• 75%

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NGSS.HS-LS3-1

NGSS.HS-LS3-2

Which of the following descriptions does not apply to meiosis?

• During the first division, the sister chromatids travel to opposite ends of the cell.

• The chromosome number of the daughter cells is half that of the parent cell.

• The homologous chromosomes synapse and form tetrads prior to the first division.

• The cytoplasm of the cell and all its organelles are divided approximately in half.

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NGSS.HS-LS3-2

In humans, hemophilia is an X-linked recessive trait. If a man and a woman have a son who has hemophilia, which of the following is definitely true?

• The mother carries an allele for hemophilia.

• The father carries an allele for hemophilia.

• The boy's paternal grandfather has hemophilia.

• Both parents carry an allele for hemophilia.

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NGSS.HS-LS3-1

NGSS.HS-LS3-2

Which of the following explains a significantly low rate of crossing over between two genes?

• The genes are located very close together on the same chromosomes.

• They are located on separate but homologous chromosomes.

• The genes code for proteins that have similar functions.

• The genes code for proteins that have very different functions.

If a woman has type A blood, and her child has type O blood, the father must have which of the following blood types?

• AB or B

• AB, or A

• A, B, O

• O only

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NGSS.HS-LS3-1

NGSS.HS-LS3-2

All of the following contribute to genetic recombination or variation in offspring EXCEPT

• random fertilization

• independent assortment

• crossing over.

• gene linkage.

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NGSS.HS-LS3-2

Chromosome number is reduced to haploid in meiosis. What event must occur to restore the diploid chromosome number?

• synapsis during prophase

• fertilization

• mitosis

• DNA replication

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NGSS.HS-LS3-2

Which of the following events is typical of the second meiotic division?

• Paternal and maternal chromosomes assort randomly.

• The chromosome number becomes haploid.

• Crossing over between nonsister chromatids occurs.

• Sister chromatids migrate to separate poles.

Which of the following is true for both meiosis II and mitosis?

• Sister chromatids separate

• Homologous chromosomes separate

• DNA replication precedes the division

• Haploid cells are produced.