Harbour seals are an aquatic mammal found in many oceans. In seals the gene E is X-linked and F,G, H are autosomal.   In a cross between a EY  Ff gg Hh  and a ee Ff gG Hh seal; List the phenotypes you would be expect in the male offspring from a test-cross of a male seal with EY  ff GG Hh  genotype

In humans, the genes for coloblindedness and hemophilia re both located on the X chromosome with no corresponding gene in the Y. These are both recessive alleles.  a. If a man and a woman, both with normal vision, marry and have a colorblind son, draw the Punnet square that illustrates this. b. If the man dies and the woman remarries to a colorblind man, draw a Punnet Square showing the type of children could be expected from hre second marriage. How many/what percentages of each could ne expected

Assume that D, E, F, G, H, and I are autosomal genes on different chromosomes. From the mating (parent A) Dd ee Ff GG Hh li x (parent B) Dd EE FF Gg Hh ii. A. What is the probability that one of the offspring will have the genotype Dd Ee FF Gg hh li? B. What is the probability that one of the offspring will be heterozygous for each allele?

Two fruit flies (Drosophila melanogaster) were crossed. The cross was between a homozygous red-eyed, wingless female and a white-eyed male heterozygous for wings. Recall that red eyes (R) is dominant over white eyes (r) and is inherited on the X chromosome (sex-linked) and as such, eye colour alleles should be written as superscript. In addition, the autosomal trait wings (W) is dominant over wingless (w). 1. List the female genotype 2. List the male genotype 3. Construct a Punnett Square for this dihybrid cross on a piece of paper, to determine what the offspring of such a cross would be with respect to sex, eye colour & wings. 4. Using the information from your Punnett Square answer the following: a. What genotypes did you get (list all genotype combinations; if you have more than one of the same kind, you do NOT have to re-list it.) b. What are the phenotypic ratios of the offspring with respect to sex, eye colour and wings?

Here is a pedigree from a family with a high prevalence of breast cancer. dx means the age at diagnosis. The letters A-E are haplotypes (alleles). dx51 [D-] dx 46 BC ☑ 7 dx58 BD (C-) 77 CD dx 44 BD AC हे dx 48 42 dx38 54 dx33 BC BC BD DA BC d.) Are there any individuals in the pedigree you might expect to have breast cancer, but do not? If so, identify the people (using the standard notation for identifying people on a pedigree) and suggest an explanation.

An individual with 46, XX genotype is diagnosed with Duchenne-type Muscular Dystrophy, a recessive X-linked disorder. Genetic tests confirm that this individual is a heterozygote for this disorder. Briefly, but specifically, explain how it’s possible that they are showing symptoms of this disorder.

Assume that you are told that a fruit fly, Drosophila, has the XO chromosome complement. You are also told that the autosomal complement is a normal 2n. You know that a humans with genotype XO would be female. What would be the sex of this XO fly and why? Group of answer choices This fly would be considered intersex based on its X:A ratio. This fly would be female due to no Y chromosome. Sex would depend on temperature dependent aromatase expression. This fly would be a female for the same reason the human would be female. This fly would be male due to an X:A ratio of 1/2.

Mice of the genotypes A/A ; B/B ; C/C ; D/D ; S/S anda/a ; b/b ; c/c ; d/d ; s/s are crossed. The progeny are intercrossed. What phenotypes will be produced in the F2 andin what proportions? [The allele symbols stand for thefollowing: A = agouti, a = solid (nonagouti); B = blackpigment, b = brown; C = pigmented, c = albino; D =nondilution, d = dilution (milky color); S = unspotted,s = pigmented spots on white background.]

Genes A, B, and C all assort independently. For the cross AaBbCc X AaBbcc, what fraction of the progeny would be expected to have the ABc phenotype?

Two autosomal genes (A and B) are located 16 m.u. apart.  A male (produced by gamete Ab fertilizing gamete aB) has children with a female that is homozygous recessive (aabb).  What is the probability of producing a son with genotype AaBb?