In birds, sex is determined by a ZW chromosome scheme. Males are ZZ and females are ZW. A lethal recessive allele that causes death of the embryo is sometimes present on the Z chromosome in pigeons. What would be the sex ratio in the offspring of a cross between a male that is heterozygous for the lethal allele and a normal female?

Which of the following traits would not be considered multi-factorial?

A gene for sweat gland production is located on the X chromosome. A man who lacks sweat glands marries a woman who has normal sweat glands. Which of the following are possible phenotypes of their children?

P, D, and Q are three genes found on a single chromosome in greyhounds. The recombination frequencies between the three genes are shown below. In which order are these genes found on the greyhound chromosome? P - D = 50%; P - Q = 20%; D - Q = 30%

Meiosis I produces ________, and meiosis II produces ________ cells.

Which of the following is not a characteristic of an X-linked recessive disorder pedigree?

Eyelash length is an inherited trait. In the human population, there is an eyelash length gene. There are two possible variants of this gene - an allele for long eyelashes (> 1cm) and an allele for short eyelashes (1 cm or less). How many eyelash length alleles does an individual have in one of her/his somatic cells?

The inheritance pattern in which the mother provides gene products to the developing egg cells is called

The H substance is needed for the proper phenotypic expression of the A, B, and AB blood types in the ABO blood typing system in humans. Individuals who are recessive for the H substance (hh) will have a type O phenotype, even if they have the A and/or B alleles. Two individuals, each with type AB blood and heterozygous at the H locus have children. What is the probability they will have a child who is phenotypically type O?

Gregor Mendel:

Imagine that fur length in a chinchilla species is a trait controlled by at least three genes. For each of these genes, short fur (PS, QS, RS) has incomplete dominance over long fur (PL, QL, or RL). A chinchilla homozygous for short fur is test-crossed with a chinchilla with long fur. What will be true of their offspring?

In rabbits, spotted coat (S) is dominant to solid color (s) and black (B) is dominant to brown (b). A true-breeding black spotted rabbit is mated to a true-breeding brown solid rabbit to produce a heterozygous F1 generation. Two F1 individuals are mated, and you do not see the typical 9:3:3:1 ratio of offspring, so you take an F1 rabbit and perform a test cross. Instead of the expected ratio, you see that most progeny look like the parental rabbits but a few are new, unique phenotype. This tells you that:

Polyploidy in plants

During prometaphase, the sister chromatids organize into a single row in the center of the cell.

A horticulturist is breeding another variety of houseplant in which two genes control leaf color. G (allele for green) is dominant to g (yellow) and B (second allele for green) is dominant to b (yellow). In this plant variety, if the two genes are homozygous recessive, then the plant is yellow. Both genes need to be dominant in order for the green color to be produced. However, if only one of these two genes is dominant, then both pigments can be produced. Two plants are crossed and a green and yellow plant is produced. Which of the genotypes listed below could apply to this green and yellow plant?

You breed a black, long-haired rabbit with a white, short-haired rabbit. All of the offspring have long, black hair. If the genes for hair color and length are closely linked on the same chromosome, what would you expect to see in the F2 generation?