Genetics Unit Test

Coat color in cats is inherited by X-linked genes, with alleles for black and orange-brown. The aleles 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?

• A 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

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%

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%

In rabbits, straight ears (E) are dominant to floppy ears (e). Two rabbits are crossed, and 50% of their offspring have floppy ears. Which cross represents the genotypes of the parents?

• EE x EE

• EE x ee

• Ee x EE

• Ee x ee

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

• 0%

• 25%

• 50%

• 100%

The data chart shows the characteristics of an individual. According to Mendel's Law of Independent Assortment, which set of daughter cells will be produced from meiosis in this individual?

• HH, HH, WW, WW

• Hh, Hh, Ww, Ww

• Hw, HW, hw, hw

• HW, HW, Hw, Hw

When a plant with red flowers (Cr Cr) is crossed with a plant that has white flowers (Cw Cw), the resulting offspring has pink flowers (Cr Cw). What mode of inheritance is observed?

• Incomplete dominance

• Complete dominance

• Codominance

• Sex-linked

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

• 25%

• 50%

• 75%

• 100%

A man with red-green color blindness (X' Y), a recessive sex-linked trait, has a child with a woman that is homozygous dominant (X X). What is the probability that a child produced from this couple will have red-green color blindness?

• 0% for male children and 0% for female children

• 0% for male children and 100% for female children

• 50% for male children and 50% for female children

• 100% for male children and 0% for female children

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%