Chapter 5: PART 2

If we cross a red pepper that is heterozygous for both traits with a cream pepper, what is the probability of having a peach pepper?

• 12.5%

• 50%

• 33%

• 25%

A black lab that is heterozygous for deposition is crossed with another of the same genotype. What is the phenotypic ratio of the offspring?

• 9 black; 6 brown; 1 yellow

• 8 black; 4 brown; 4 yellow

• 9 black; 3 brown; 4 yellow

• 9 black; 4 brown; 3 yellow

If a man who has the AB blood type marries a woman who has the Ai blood type, what is the probability that they will have children with type O blood?

• 25%

• 75%

• 50%

• 0%

If you cross Ww Yy x Ww Yy, what is the probability of getting a yellow squash?

• 3/16

• 9/16

• 1/4

• 1/2

What is the molecular explanation for dominant epistasis in squash coloration?

• Dominant allele at Y locus produces first enzyme changing color to green.

• Only one enzyme is required for color production.

• Yellow color is produced in a 2-step enzymatic reaction.

• Homozygous recessive genotype at W locus produces enzyme that changes color to yellow.

What is the genetic maternal effect?

• Phenotype is determined by the cytoplasmic genotype of the father.

• Offspring's phenotype is determined by its own genotype.

• Offspring's phenotype is determined by the nuclear genotype of its mother.

• Phenotype is determined by the genotype of the father.

What is genomic imprinting?

• Only paternal genes are expressed.

• All genes are equally expressed, regardless of parental origin.

• Expression of genetic material is dependent upon whether it is inherited from the mother or father.

• Only maternal genes are expressed.

What does epigenetics study?

• Changes in gene function that are heritable without a change in DNA sequence.

• The study of genetic mutations.

• The study of chromosomal alterations.

• The study of gene suppression.

What is a temperature-sensitive allele?

• An allele that is never functional.

• An allele that is always functional regardless of environmental conditions.

• An allele that changes its function based on humidity.

• An allele whose product is functional only at certain temperatures.

What is anticipation in genetics?

• A genetic trait skips generations before expressing.

• A genetic trait remains unchanged across generations.

• A genetic trait is expressed later and weaker in subsequent generations.

• A genetic trait is expressed earlier and more strongly in subsequent generations.