Exam 4: Extensions of Mendelian Inheritance

Male-pattern baldness is a sex-linked trait in humans.

Variable expressivity means that the phenotype of a trait can vary between individuals.

At the molecular level, type A and type B blood differ in which of the following characteristics?

Which of the following is not correct concerning epistatic interactions?

In an epistatic interaction, the genes must be located on the same chromosome.

Sickle-cell anemia in humans is an example of .

If a geneticist describes a trait as being 70% penetrant, what would they mean?

A heterozygote possesses a phenotype that is intermediate between the homozygous dominant and homozygous recessive phenotypes. This is most likely an example of .

If a combination of two or more genes is required to produce a specific trait, it is called a .

In overdominance, the genotype is beneficial over the genotypes.

Typically, a recessive allele increases the expression of a functional protein.

Incomplete dominance is an example of blending of phenotypes, not genotypes.

The interaction of two genes to produce a phenotype was first described by .

If a light-eosin eye male Drosophila is crossed to a homozygous red eyed female, what will be the phenotype of their offspring?

A allele encodes a protein that is made in the proper amount and functions normally.

A woman who is heterozygous for pattern baldness marries a man who is nonbald. Which of the following would be true of their offspring?

In a dihybrid cross of two heterozygous individuals, you expect a 9:3:3:1 phenotypic ratio in the offspring, but observe a ratio of 9:7. What is the most likely explantation?

In humans, pattern baldness follows a sex-influenced pattern of inheritance. A heterozygous male has the phenotype and a heterozygous female has a phenotype.

Polydactyly in humans is an example of .

Temperature-sensitive alleles are examples of .