Unit 10 Genetics

In screech owls, red feathers are dominant over gray feathers. If two heterozygous red-feathered owls are mated, what percentage of their offspring would be expected to have red feathers?

• 25%

• 50%

• 75%

• 100%

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In human genetics, brown eyes (B) are dominant over blue eyes (b). A brown-eyed man is heterogeneous (Bb). He marries a blue-eyed woman. What is the probability of their child having blue eyes?

• 100%

• 75%

• 25%

• 50%

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A female is homozygous for a recessive trait (rr), while the male is homozygous dominant for the same trait (RR). What percentage of their offspring would be expected to exhibit the dominant trait?

• 0 percent

• 25 percent

• 50 percent

• 100 percent

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A Punnett square of red (R) and white (r) flower colors is shown below. Which explanation describes how the presence of a white flower color occurred in the offspring?

• Parents are homozygous for the dominant gene expressing red color

• Parents are heterozygous for the dominant gene expressing red color.

• Parents are homozygous for the recessive gene expressing white color.

• Parents are heterozygous for the recessive gene expressing white color.

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In some cat breeds, short hair (H) is dominant to long hair (h). A homozygous male cat with short hair and a long-haired female cat produce offspring. Which percentage of the offspring is predicted to have short hair?

• 100%

• 75%

• 50%

• 25%

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Gregor Mendel studied the inheritance pattern of several characteristics in pea plants. He observed that tall (T) plants were dominant to short (t) plants. If a heterozygous tall plant is crossed with a short plant, what percentage of the offspring will be short?

• 0%

• 25%

• 50%

• 75%

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A person is heterozygous for a certain trait. What is the expected percent chance the person will produce an allele with a dominant trait after meiosis?

• 25%

• 50%

• 75%

• 100%

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The diagram below shows a cross between two pea plants that differ in two characteristics: pod shape and pod color. What conclusions can be drawn based on the information in the diagram?

• green is dominant, yellow is recessive; inflated is dominant, wrinkled is recessive

• green is dominant, yellow is recessive; wrinkled is dominant, inflated is recessive

• yellow is dominant, green is recessive; inflated is dominant, wrinkled is recessive

• yellow is dominant, green is recessive; wrinkled is dominant, inflated is recessive

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What is the name for the offspring between two different homozygous parents?

• incomplete dominance

• a purebred

• a sex-linked gene

• a hybrid

According to the diagram, what is the approximate probability that a human offspring will be female?

• 10%

• 25%

• 50%

• 75%

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