Exam 12: Inheritance, Genes, and Chromosomes

A heterozygous tall, round-seed plant is crossed to a double-recessive, short, wrinkled-seed plant.What do we call the frequency at which short round seed and tall wrinkled seed are seen in the offspring?

In cats, black coat (B) is codominant with yellow (b).The coat color gene is on the X chromosome.Calico cats, which have coats with black and yellow patches, are heterozygous for the coat color alleles.A calico female, Pickle, has a litter, whose characteristics are found in the table. What is the genotype and phenotype of the father?

If bacterial conjugation is allowed to take place for more than an hour, then two different genes (A and B) are transferred together.Even if conjugation occurs for only a few minutes, both A and B or neither of the genes is conjugated.It's only when conjugation takes place for only a few seconds that you see instances of only one of the genes being transferred.Most likely, genes A and B

Two genes with two alleles each are 30 centiMorgans (map units) apart.A double heterozygote whose parents were homozygous dominant and homozygous recessive is crossed to a double homozygous recessive.What frequency in the progeny will be double homozygotes?

In pea plants, the allele R produces a red flower and is dominant to the white allele (r).A pea plant with red flowers is test crossed, and one-half of the resulting progeny have red flowers, whereas the other half have white flowers.Therefore, the genotype of the test-crossed parent was

Refer to the figure showing a family pedigree and recessive inheritance.Note the mother in generation I is a carrier of a rare recessive autosomal trait. What is the probability an individual in generation IV will have the disease?

Refer to the figure showing a family pedigree in which several individuals develop a neurodegenerative disease late in life. If individual A (in generation III) has children with an unaffected woman, what is the probability that their first child will be affected?

The simple device that ensures that we consider all possible combinations of gametes when calculating expected genotype frequencies is known as a(n) _______ square.

Jane is a better tennis player than Jack.If the probability that Jane will beat Jack in any given game is 0.7, what is the probability that they will each win one game if they play two games? (Note that there are two ways they can arrive at this outcome: Jane wins the first game or Jack wins the first game.)

In birds, males have two Z chromosomes, and females have a Z chromosome and a W chromosome.Suppose a gene that affected egg production was Z linked.Which value would be the best predictor of a female's egg production?

A true-breeding strain of tall soybean plants is crossed with a true-breeding strain of short soybean plants.All the offspring are short.Thus, tall is a _______ trait.

Refer to the table.In Drosophila, white (w), eosin (w^e), and wild-type red (w⁺) are multiple alleles at a single locus for eye color.This locus is on the X chromosome.A female that has eosin (pale orange) eyes is crossed with a male that has wild-type (red) eyes.All the female progeny are red-eyed; about half the male progeny have eosin eyes, and about half have white eyes.Assume the female has two X chromosomes and the male has one X and one Y. What are the genotypes of the parents?

The t locus is involved in the production of tails in a mouse; tt individuals are without tails, whereas TT and Tt have tails.The l locus is involved in the color of tails: assuming that they have tails, individuals that are ll have light tails, whereas all others have dark tails.The two loci are on different chromosomes.In an F₂ cross between TTLL and ttll individuals, what fraction will have light tails?

Which traits are most likely to be considered quantitative?

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 is the chance that she has Huntington's chorea?

In garden peas, the allele for tall plants is dominant over the allele for short plants.A true-breeding tall plant is crossed with a short plant, and one of their offspring is test crossed.Out of 60 offspring resulting from the test cross, _______ should be short.

Suppose that in a certain population of lizards, the probability of the birth of a male is 0.6.Assume that the sex of each individual is independently determined.What is the probability that a clutch of three will have exactly two females? (Note that there are three ways to arrive at this outcome when calculating the probabilities of each egg's sex.)

Curly wing is recessive to straight wing in Drosophila.In a cross between true-breeding curly- and straight-winged parental flies, there are 480 flies in the F₂ generation.How many F₂ progeny should have curly wings?

Suppose a woman has blood type AB.From this, we can infer that

If big feet (B) in schmoos is dominant to small feet (b), the genotype of a big-footed schmoo with respect to the foot gene can