Exam 16: Mendelian Inheritance

In the F₂ generation of a homozygous round (AA) × homozygous wrinkled (aa) cross in peas, three seeds are chosen at random. What is the probability that all three seeds are round?

Variable expressivity implies that the disease may not always be present (in individuals with a genotype that "should" lead to disease).

In genetic crosses, the symbols AA and Aa refer respectively to:

Which of the following statements is TRUE regarding brachydactyly?

Consider a gene with n alleles A₁, A₂, ..., A_n. How many distinct heterozygous genotypes are possible?

When one gene is able to modify the effect of a second gene, the phenomenon is known as:

Which of the following represents the expected genotypes of an F₁ generation consisting of 16 individuals from a cross of a true-breeding black (BB) rabbit and a true-breeding white (bb) rabbit?

The F₁ generation of a cross between two individuals, one that is homozygous dominant for a trait and the other that is homozygous recessive for the trait, will yield progeny with the same phenotype.

In the F₂ generation of Mendel's monohybrid crosses, the 3:1 ratio refers to:

The expression (¹/₂ A + ¹/₂ a)² is the mathematical equivalent of a:

In Mendel's peas, an individual that is heterozygous for seed color:

With independent assortment, the ratio of phenotypes in the F₂ generation of a cross between true-breeding strains (AA bb × aa BB) can be described as 9:3:3:1 when A and B are dominant over a and b. What phenotype does the "9" in the ratio refer to?

Which of the following is considered a trait?

If blending inheritance was an accurate model of transmission genetics, which of the following would be TRUE?

With independent assortment, the ratio of genotypes in the F₂ generation of a cross between true-breeding strains (AA bb × aa BB) can be described as 1:2:1:2:4:2:1:2:1. To what genotypes do the "2s" in the ratio refer?

The statement that, in garden peas, yellow seed is dominant to green seed means that:

In the F₂ generation of a homozygous round (AA) × homozygous wrinkled (aa) cross in peas, three seeds are chosen at random. What is the probability that two seeds are round and the other is wrinkled?

Mothers who consume excessive alcohol during pregnancy may have babies who are affected with a pattern of physical and mental disabilities known as fetal alcohol syndrome. Similarly, mothers who become addicted to drugs during pregnancy may have babies who show signs of addiction. Do these examples contradict the statement that traits acquired by the parents are not transmitted to the offspring?

Animals that sexually reproduce are _____ and produce _____ gametes.

Huntington's disease is a devastating neurological disorder. If a child of an affected parent receives one copy of the Huntington allele, he or she will develop Huntington's disease. Thus, Huntington's disease is considered _____ trait.