Heredity Test Review

In chickens, the trait for yellow legs (Y) is dominant over the trait for white legs (y). A breeder wants to cross his chickens to have offspring with an equal ratio of chicks with yellow and white legs. Which Punnett square best represents the outcome that the breeder desires?

• A

• B

• C

• D

In guinea pigs, the allele for black eyes (B) is dominant over the allele for red eyes (b). A male guinea pig that is heterozygous for the eye color trait is crossed with a female guinea pig that has red eyes. Which Punnett square correctly shows the outcome of the cross?

• A

• B

• C

• D

In pea plants, the gene for yellow seeds (Y) is dominant over the gene for green seeds (y). A pea plant that is homozygous dominant for seed color is crossed with a pea plant that is heterozygous dominant. Which Punnett square shows the result of the cross?

• A) Yy, yy, Yy, yy

• B) YY, YY, YY, YY

• C) YY, Yy, YY, Yy

• D) YY, Yy, Yy, yy

Jackson’s mother and father both have normal blood cells, a dominant trait, while Jackson has sickle cell anemia, a recessive trait. Which genotype for sickle cell anemia represents each of Jackson’s parents’ traits?

• A) Aa

• B) AA

• C) normal blood cells

• D) sickle cell anemia

A pea plant that is purebred dominant for green seed pods is crossed with a plant that is hybrid for green seed pods. Which Punnett square represents this cross and the resulting offspring?

• A) GG, GG, Gg, Gg

• B) Gg, Gg, gg, gg

• C) GG, Gg, GG, Gg

• D) Gg, gg, Gg, gg

Two plants with hybrid genotypes for smooth seeds are crossed with one another. What percentage of the offspring should have the recessive phenotype of wrinkly seeds?

• A) 100%

• B) 75%

• C) 50%

• D) 25%

What is the likely conclusion that the child can make from studying the table?

• A) Traits of individuals are inherited from all family members.

• B) Traits of individuals living together are always all the same.

• C) Traits are transferred from parents to their offspring.

• D) Traits are transferred among the parents of an offspring.

In chickens, rose comb is dominant over single comb. If a homozygous rose comb male is crossed with a heterozygous female, what percentage of the offspring would likely have a rose comb?

• 25%

• 50%

• 75%

• 100%

A snapdragon plant with red flowers (RR) is crossed with a snapdragon plant with white flowers (WW). Snapdragon flowers show incomplete dominance. A Punnett square of the cross is shown below. If the cross produces four offspring, how many of each color flower would likely be produced?

• four red flowers

• four pink flowers

• two red flowers and two pink flowers

• two white flowers and two pink flowers

Considering the biologist’s data, what are the most likely genotypes of the flies that are crossed?

• NN × nn

• Nn × nn

• Nn × Nn

• Nn × NN