Biology Unit 9 (Quiz Questions)

If A is dominant to a and B is dominant to b, what is the expected phenotypic ratio of the cross: AaBb × AaBb? A. 9:3:3:1 B. 8:4:2:2 C. 4:4:4:4 D. 16:0:0:0

A. 9:3:3:1

Dr. Smith's parents have normal hearing. However, Dr. Smith has an inherited form of deafness. Deafness is a recessive trait that is associated with the abnormal allele d. The normal allele at this locus, associated with normal hearing, is D. Dr. Smith's parents could have which of the following genotypes? A. Dd and Dd B. DD and dd C. DD and DD D. dd and dd

A. Dd and Dd

Which of the following statements regarding genotypes and phenotypes is false? A. Alleles are alternate forms of a gene. B. An allele that is fully expressed is referred to as recessive. C. An organism with two different alleles for a single trait is said to be heterozygous for that trait D. The genetic makeup of an organism constitutes its genotype.

B. An allele that is fully expressed is referred to as recessive.

Probability is a major part of genetics, and two very common rules are the Rule of Addition and the Rule of Multiplication. Using a six-sided die, what is the probability of rolling either a 5 or a 6? A. 1/6 + 1/6 = 1/12 B. 1/6 × 1/6 = 1/36 C. 1/6 + 1/6 = 1/3 D. 1/6 + 1/6 = 2/3

C. 1/6 + 1/6 = 1/3

All the offspring of a cross between a black-eyed crow and an orange-eyed crow have black eyes. This means that the allele for black eyes is ________ the allele for orange eyes. A. codominant to B. recessive to C. dominant to D. more aggressive than

C. dominant to

A person with AB blood illustrates the principle of A. incomplete dominance. B. pleiotropy C. polygenic inheritance D. codominance

D. codominance

A carrier of a genetic disorder who does not show symptoms is most likely to be ________ to transmit it to offspring. A. homozygous for the trait and able B. homozygous for the trait and unable C. heterozygous for the trait and unable D. heterozygous for the trait and able

D. heterozygous for the trait and able

All the offspring of a cross between a red-flowered plant and a white-flowered plant have pink flowers. This means that the allele for red flowers is ________ to the allele for white flowers. A. dominant B. codominant C. recessive D. incompletely dominant

D. incompletely dominant

Genes located close together on the same chromosomes are referred to as ________ genes and generally ________. A. linked . . . sort independently during meiosis B.homologous . . . are inherited together C. associated . . . sort independently during meiosis D. linked . . . do not sort independently during meiosis

D. linked . . . do not sort independently during meiosis

The individual features of all organisms are the result of genetics AND the environment. True or False

True