AP Bio Ch 11 and 12 Genetics

A trait controlled by two or more genes is called a(n) a. polygenic trait b. multiple allele trait c. sex linked trait d. autosomal trait

a

If two parents that express the dominant phenotype produce an offspring with a recessive phenotype, then probably a. both parents are heterozygous b. one parent is heterozygous c. both parents are homozygous d. one parent is homozygous

a

Which of the following is the most likely explanation for a high rate of crossing-over between two genes? a. The two genes are far apart on the same chromosome. b. The two genes are both located near the centromere c. The two genes are sex-linked d. The two genes code for the same protein e. The two genes are on different chromosomes

a

A family record that indicated the occurence of a trait is a a. karyotype b. pedigree c. chromosomal map d. sonogram

b

A trait controlled by three or more alleles is a(n) a. polygenic trait b. multiple allele trait c. sex linked trait d. autosomal trait

b

Genes that are found near one another and belong to the same linkage group tend to be a. located on different chromosomes b. inherited together c. found only in males d. found only in somatic cells

b

Geneticists may use pedigrees to determine a. environmental effects on the expression of a gene or trait b. whether someone could be a carrier for a genetic disorder c. the position of a gene on the chromosome d. the frequency of a gene for an entire population

b

In order to produce a male offspring, an egg must be fertilized by a sperm carrying a a. X chromosome b. Y chromosome c. X and Y chromosome

b

In guinea pigs, black fur is dominant. A black guinea pig is crossed with a white guinea. If the litter contains a white offspring, the genotype of the black parent is probably a. homozygous dominant b. homozygous recessive c. heterozygous

c

Suppose you have found a new species of plant. Some of the plants have yellow flowers and some have red flowers. You cross a red with a yellow. All of the offspring have orange flowers. Suggest an explanation. a. the gene for yellow is dominant b. the gene for red is dominant c. the genes are incompletely dominant

c

in a monohybrid cross between two heterozygous parents, one would expect the offspring's genotype to be a. 3 Aa: 1 aa b. all Aa c. 1AA: 2Aa: 1 aa

c

A mother with blood type B gives birth to a child with blood type A. The father must have which of the following blood types a. AB only b. either AB or B c. either AB or O d. either AB or A

d

In a monohybrid cross between a homozygous dominant parent and a homozygous recessive parent, one would predict the offspring's genotype to be a. all homozygous dominant b. 2:2 homozygous to heterozygous c. 3:1 homozygous to heterozygous d. all heterozygous

d

In humans red-green color blindness is an X-linked recessive trait. If a man and a woman produce a color blind son, which must be true a. the father is color blind b. both parents carry the allele for color blindness c. neither parent carries the allele for colorblindness d. the mother carries the allele for color blindness

d

Labrador retrievers are black, brown, or yellow. In a cross of a black female with a brown male, results can be either all black, 1/2 black and 1/2 brown, or 3/4 black and 1/4 yellow. This indicates a. brown is dominant to black b. black is dominant to brown and to yellow c. yellow is dominant to black d. epistasis is involved

d

Mendel's observation of the segregation of alleles in gamete formation has its basis in which of the following phases of cell division a. prophase I b. anaphase II c. metaphase I d. anaphase I

d