In fruit flies, grey body colour (G) is dominant over black body colour (g). A cross between a heterozygous grey fruit fly and a black fruit fly can be represented by   Select one: a. GgGG b. GgGg c. Gggg d. GGgg

The mating below shows the sex chromosome found in two parents and their resulting offspring. Use this family information to answer the following questions. Xfmr1 Y x Xfmr1 XFMR1 → XFMR1 XFMR1Y How many Barr bodies would the child have?   a. 3   b. 2   c. 1   d. 0   e. Cannot be determined

If a two-point testcross of heterozygous females and homozygous-recessive males in Drosophila results in a calculated map distance of 10 cM between the two genes, the offspring of the cross must have shown four phenotypes in a ratio of a. 9:3:3:1 b. 1:1:1:1 c. 19:19:1:1 d. 3:3:1:1 e. 9:9:1:1

In fruit flies, red eyes (E) are dominant to white eyes (e). Cross two heterzygotes.  a. What are the possible genotypes for red eyes ? b. What are the possible genotype(s) for white eyes ?

Define epistasis? a. Allelic variation at two different genes adds together in order to produce a phenotypic outcome b. Genetic variation and environmental variation both affect a given phenotype c. Allelic variation at one gene prevents or conceals the phenotypic consequences of allelic variation at a different gene d. Allelic variation at single gene affects many different phenotypes e. Genes that are near the start of a gene cluster are expressed before genes near the end of the cluster

In humans, hemophilia is an x- linked recessive condition characterized by the inability of blood to clot normally. A woman who is a carrier for hemophilia marries a man who has hemophilia. What proportion of their male children will have hemophilia.  A. 0%b. 25%C.50%d. 75%e. 100%

A spotted rabbit, when mated with a solid-colored rabbit, produced all spotted offspring. When these F1­ rabbits were crossed among themselves, they produced 24 spotted rabbits and 8 solid-colored rabbits. Which of these characters is dependent on a dominant gene? a. spotted rabbit b. solid-colored rabbit

Red-green color blindness is controlled by a recessive allele on the X chromosome.  A colorblind father and a normal vision mother have a daughter with red green color blindness.  If they have a son what is the probability that he will be color blind?  Group of answer choices a. 0.75 b. 0.5 c. 0 d. 1 e. 0.25