Exam 12: Inheritance, Genes, and Chromosomes

The genetic disease blue sclera is determined by an autosomal dominant allele. The eyes of individuals with this allele have bluish sclera. These same individuals may also suffer from fragile bones and deafness. This is an example of

In mice, short hair is dominant to long hair. If a short-haired individual is crossed with a long-haired individual and both long- and short-haired offspring result, one can conclude that

In guppies, fan tail is dominant to flesh tail, and rainbow color is dominant to pink. F₁ female guppies are crossed with flesh-tailed, pink-colored males, and the following progeny are observed: 401 fan-tailed, pink-colored; 399 flesh-tailed, rainbow-colored; 98 flesh-tailed, pink-colored; and 102 fan-tailed, rainbow-colored guppies. Assuming that the F₁ female guppies have both dominant alleles on one chromosome, the map distance between these two genes is

A linkage group corresponds to

In the garden peas used in Mendel's experiments, the spherical seed character (SS) is completely dominant over the wrinkled seed character (ss). If the characters for height were incompletely dominant, such that TT was tall, Tt was intermediate, and tt was short, what would have resulted from crossing a spherical-seeded, short (SStt) plant to a wrinkled-seeded, tall (ssTT) plant?

If Mendel had performed experiments on cattle rather than on peas, the patterns of inheritance would not have been easily detectable, because cattle

A human male carrying an allele for a trait on the X chromosome is

What is the probability that a cross between a true-breeding pea plant with spherical seeds and a true-breeding pea plant with wrinkled seeds will produce F₁ progeny with spherical seeds?

When many genes contribute to the phenotype, variation is said to be continuous, or _______.

What fraction of the offspring of the cross AaBb $\times$ AaBb would show the dominant phenotypes for both genes?

A(n) _______ trait is one that can be passed from one generation to another.

A dihybrid cross

Incomplete dominance

When a given trait is the result of multigene action, one of the genes may mask the expression of one or all other genes. This phenomenon is termed

Classical albinism results from a recessive allele. Which of the following is the expected ratio for the progeny when a normally pigmented male with an albino father has children with an albino woman?

Recombination is most likely to occur between two loci that are _______.

Quantitative variation is the result of the interaction of _______ and _______.

Draw a pedigree for three generations in which the grandfather has red-green color blindness and his daughter is a carrier. This daughter has four sons. Predict how many of the sons will be color-blind.

In the F₂ generation of a dihybrid cross

Genes located on mitochondrial DNA are usually inherited in what fashion?