Biology EOC Review - Unit 10 - Genetics

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?

• 25%

• 50%

• 75%

• 100%

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When red carnations are crossed with white carnations, the resulting flowers are pink. Pink carnations are an example of what type of inheritance pattern?

• incomplete dominance

• recessive alleles

• dominant alleles

• codominance

The table below lists human blood group genotypes and phenotypes.

Why is the AB phenotype a result of codominance?

• Neither allele is expressed in the phenotype.

• Both alleles are equally expressed in the phenotype.

• One allele masks the expression of the other during expression of the phenotype.

• Both alleles blend together to form an intermediate phenotype during expression.

Coat color in cats is inherited by X-linked genes, with alleles for black and orange-brown. The alleles and phenotypes are as given below.

A cross between an orange-brown male and a homozygous black female produce four kittens. What is the phenotypic probability of the offspring?

• 50% black female and 50% black male

• 50% calico female and 50% black male

• 50% orange-brown female and 50% black male

• 50% calico female and 50% orange-brown male

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This diagram shows a diploid cell with two pairs of homologous chromosomes.

Due to independent assortment, what is the possible genetic make-up of gametes produced by this organism?

• SsTt

• Ss, Tt

• S, s, T, t

• ST, St, sT, st

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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%

• 50%

• 25%

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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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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 sheep, producing white wool (W) is dominant to black wool (w), and having brown eyes (E) is dominant to blue eyes (e). A cross of two heterozygous sheep is shown in the Punnett square below

Which of the following describes an outcome of this cross?

• 1/16 will have white wool and brown eyes

• 3/16 will have black wool and brown eyes

• 4/16 will have white wool and blue eyes

• 9/16 will have black wool and blue eyes

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