Exam 12: Inheritance, Genes, and Chromosomes

Use the following to answer questions: Cleft chin is an X-linked dominant trait. Assume that a man with a cleft chin marries a woman with a round chin. -What percent of their female progeny will show the cleft chin trait?

The totality of all the genes of an organism is known as the organism's _______.

Sex determination in humans and Drosophila is similar because

The fact that a trait like height in humans varies over a wide range of values is due to

A dominant allele K is necessary for normal hearing. A dominant allele M on a different locus results in deafness no matter which other alleles are present. If a kkMm individual is crossed with a Kkmm individual, _______ percent of the offspring will be deaf.

A female that is heterozygous for a recessive sex-linked trait is called a _______.

Mendel concluded that each pea has two units for each character, and each gamete contains one unit. Mendel's "unit" is now referred to as a(n)

Suppose you are a genetics counselor who is working with a 21-year-old pregnant woman who has just discovered that her father has Huntington's chorea, a rare dominant autosomal trait. This disease usually develops in middle age, so people carrying this trait do not find out they have this genetic disorder until midlife. What are the chances that the child she is carrying will develop the disease? (Assume that her husband's family has no history of the disease.) What is the chance that she has Huntington's chorea?

White eyes is a recessive sex-linked trait in fruit flies. If a white-eyed female fruit fly is mated to a red-eyed male, their offspring should be

Tall pea plants are crossed to short, and the progeny are medium height. The F₁ plants are crossed together, but the progeny observed among the F₂ have nine different size classes. This result is best explained by

To determine the overall probability of independent events, one should _______ the probabilities of the individual events.

An organism that produces either male gametes or female gametes, but not both, is called

In cocker spaniels, black color (B) is dominant over red (b), and solid color (S) is dominant over spotted (s). If the genes are unlinked and the offspring of BBss and bbss individuals are mated with each other, what fraction of their offspring will be black and spotted?

Codominance

A particular genetic cross in which the individual in question is crossed with an individual known to be homozygous for a recessive trait is referred to as a

To determine the probability of an event that can occur in two or more different ways, one should _______ the individual probabilities.

Segregation of alleles occurs

Linked genes

A(n) _______ is an observable feature, such as flower color; a(n) _______ is a particular form of a character, such as a white flower.

Which of the following is a true statement?