Genetics Questions

Hemophilia is inherited with an X-linked recessive allele. Which term describes the genotype for a male who has this blood-clotting disorder?

What is the value for interference if the coefficient of coincidence is 0.3?

The presence of the SRY gene on the Y chromosome in mammals determines _blank_.

Human females produce egg cells by a process called

Choose all gametes normally produced by an XXY fruit fly.- XX- X- Y- YY- XY- XXX- XXY

Bridges observed that in a cross between white-eyed females and red-eyed males, the majority of the progeny were red-eyed females and white-eyed males. However, a very small number of progeny were red-eyed males and white-eyed females. Bridges proposed that these unusual progeny were due to __________ during meiosis.

In somatic cells of human females, a random one of the two X chromosomes is turned off. What is this mechanism called?

A trait that a son can inherit only from his mother must be due to an allele found on __________.

You are studying three Drosophila genes, vg (vestigial wings), b (black body) and pr (purple eyes) which are located on the same chromosome. You perform a three-point testcross between a female vg b pr / vg+ b+ pr+ fly and a male vg b pr / vg b pr fly (note that genes are arbitrarily ordered when representing the genomes of the flies, as prior to the cross, their order is unknown). Out of a total number of 4197 offspring, you obtain 3433 flies with parental combinations for the three genes, 493 flies that are recombinants for vg relative to parental combinations for b and pr, 249 flies that are recombinants for b relative to parental combinations for vg and pr, and 22 flies that are recombinants for pr relative to parental combinations for vg and b. Based on this data, which gene is located between the other two?

A chromosome contains three genes in the following order: a - b - c. The distance between gene a and b is 5 m.u. The distance between b and c is 3 m.u. What is the expected likelihood of a double crossover?

If gene A is linked to gene B, and B to C, and C to D, they are collectively called a(n) _______ __________

In fruit flies, two of the X-linked white gene alleles are: w+, which specifies red eyes, and w, which confers white eyes. The w+ allele is dominant to the w allele. How would you specify a male with white eyes?

You are following two X-linked genes in a two-factor cross using Drosophila. If the genes assort independently, an F1 dihybrid female should produce ______________.

In a three-factor cross, what is the result of complete interference?

A three-point testcross involving three linked genes results in 8 progeny classes: 2 are parental types and 6 are recombinant types. Which of the recombinant classes correspond to offspring produced by gametes with double-crossover chromosomes?

A phenomenon involving animals of the same species, but of opposite sexes, that have different physical features is called ________ __________.

When male flies inherit their eye color from their mother, and female flies inherit their eye color from their fathers, this is an example of ____________ inheritance.

When following the inheritance of two genes, a testcross is a cross between ___________.

Consider a testcross between a white-eyed male fruit fly and a heterozygous red-eyed female. The offspring are expected in what proportion?

One form of hereditary deafness is inherited with an X-linked recessive allele. A woman with normal hearing has a son with hereditary deafness. The woman's genotype at this gene locus is ______.