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Heredity — Test Answers

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Which is an external environmental factor that affects heredity?

A
nutrition
B
structural differences
C
hormones
D
gender
22
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Glaucoma is a leading cause of blindness. Studies have linked a common form of glaucoma to three genes and more than 20 genetic loci. Which best describes glaucoma?

A
a dominant trait that depends on the presence of only one of many dominant alleles
B
a polygenic trait that is influenced by the alleles of several genes
C
a codominant trait that is expressed more often when more dominant alleles are present
D
a recessive trait that requires multiple recessive alleles to be expressed
23

Mary has type A blood. Her son Bill has type AB blood. Which blood type does Bill's dad have if he is homogenous for blood type?

A
A
B
AB
C
O
D
B
24

Which of Mendel’s generations was allowed to self-pollinate?

A
cap p generation and cap f sub 2 generation
B
cap f sub 1 generation
C
cap p generation
D
cap f sub 1 generation and cap f sub 2 generation
25

A pea plant exhibits a recessive trait. Which statement is most likely true about the plant?

A
The plant is identical to its parent plant.
B
The plant has two identical alleles for the gene that codes for the trait.
C
The plant has different alleles for the gene that codes for the trait.
D
The plant does not have the same genes for the trait as its parent plant.

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