Question 1

Which of the following is NOT a reason that peas were well suited for Mendel's breeding experiments?

Accepted Answer

Peas have an unusually long generation time.

Question 2

A pea plant is heterozygous at the independent loci for flower color (Pp) and seed color (Yy). What types of gametes can it produce?

Accepted Answer

Four gamete types: PY, Py, pY, and py

Question 3

A cross between homozygous purple-flowered and homozygous white-flowered pea plants results in offspring with purple flowers. This demonstrates:

Accepted Answer

Dominance.

Question 4

ABO blood type in humans exhibits codominance and multiple alleles. What is the likelihood of a type A father and a type A mother having a type O child?

Accepted Answer

25% if both parents are heterozygous

Question 5

Roan cattle result from incomplete dominance of red and white alleles at a single locus. If two roan cattle are allowed to breed, what ratio of phenotypes is expected in the offspring?

Accepted Answer

1:2:1 red:roan:white

Question 6

A phenotypic trait that is dependent on several genes and environmental conditions is said to be:

Accepted Answer

Multifactorial.

Question 7

Suppose that Mendel's hypothesis that inheritance is particulate rather than due to blending were wrong. Which observation would he have NOT made?

Accepted Answer

Crossing two purple-flowered heterozygotes produced purple-flowered and white-flowered plants.

Question 8

Look around the classroom. Which of the following human phenotypes can likely be considered to be polygenic?

Accepted Answer

All of the above

Question 9

If a plant with genotype $$RrYy is $$self-crossed, what is the expected phenotypic ratio among the offspring, assuming independent assortment?

Accepted Answer

$$9:3:3:1$$

Question 10

Which of the following best explains why Mendel's laws are not always observed in human inheritance patterns?

Accepted Answer

Many human traits are influenced by multiple genes and environmental factors.

Question 11

A woman with blood type AB and a man with blood type O have children. What are the possible blood types of their children?

Accepted Answer

A or B

Question 12

Which of the following is an example of pleiotropy?

Accepted Answer

A single gene affects both flower color and seed shape in peas.

Question 13

If a genetic disorder is caused by a recessive allele, what is the probability that two heterozygous parents will have an affected child?

Accepted Answer

$$\frac{1}{4}$$

Question 14

Which of the following scenarios best illustrates the law of independent assortment?

Accepted Answer

A plant with genotype $$RrYy$$ produces gametes $$RY$$, $$Ry$$, $$rY$$, and $$ry.$$

Question 15

Which of the following is a real-world example of codominance?

Accepted Answer

AB blood type in humans

Mendelian Genetics and the Gene Idea – Study Guidance

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