3) In the snail Capaea nemoralis, an autosomal allele causing a banded shell (B®) is recessive to the allele for an unbanded shell (Bº). Genes at a different locus determine the background color of the shell; here yellow (C") is recessive to brown (CB"). A banded, yellow snail is crossed with a homozygous brown, unbanded snail. The F1 are then crossed with banded, yellow snails (a test cross). b. What will the results be of the testcross be if the loci assort independently?

6) Duchenne muscular dystrophy (DMD) is a muscle wasting disease and is an X-linked recessive disorder. A man with this disease has children with a woman who does not have the disease, but her father did. If they had a ason, what would be the chance that he would have DMD? If they had a daughter? Any child? Construct a Punnett square to determine the answers. 10) In cats, coat color is completely dominant to albino (Mendelian genetics) and is an autosomal trait. Playa is a female albino cat and is crossed with Azul, a black-coated male. In their first litter, they have 4 black kittens and 2 albino kittens. If in the second litter, they have 8 kittens, how many of the kittens are expected to be albino? Construct a Punnett Square to determine the answer.

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.

a) Which of the four modes of inheritance are consistent with the disease shown in this human pedigrees below? (List the compatible mode or modes) Give an answer for a, b and c b) If the parents in pedigree c have 2 other children, what is the probability that they will carry the disease?

In human beings, the gene for red‑green colorblindness (r) is sex‑linked and recessive to its allele for normal vision (R), while the gene for freckles (F) is autosomal and dominant over its allele for nonfreckled (f).  A nonfreckled, normal‑visioned woman whose father was freckled and colorblind, marries a freckled, colorblind man whose mother was nonfreckled. What is the probability that the first child born to the couple will either be a freckled, colorblind boy or a non‑freckled, normal visioned girl or a non-freckled, normal visioned boy?   What is the probability that the first four children born to the couple will be freckled and normal visioned girls?

3) You have sought a job at a human genetic counseling clinic. They gave you an aptitude test shown below. Answer the yes/no questions concerning each of the following pedigrees. Pedigree A: YES or NO Could this trait be inherited as a simple autosomal recessive? Could this trait be inherited as a simple autosomal dominant? Could this trait be inherited as a simple X-linked recessive? Could this trait be inherited as a simple X-linked dominant? Pedigree B: YES or NO Could this trait be inherited as a simple autosomal recessive? Could this trait be inherited as a simple autosomal dominant? Could this trait be inherited as a simple X-linked recessive? Could this trait be inherited as a simple X-linked dominant?

An AABB zebra fish is crossed with an aabb zebra fish. (A) is the dominant allele and (a) is the recessive allele of an autosomal gene. Similar relations exist between (B) and (b) alleles of another fish autosomal gene, at a different locus. The F1 are crossed with a homozygote recessive. a)What will be the results of the testcross and the progeny ratios if genes A and B are completely linked?     b)What will the results of the testcross be if the loci assort independently?   c) What will the results of the testcross be if the loci are linked with a certain recombination (crossing over) frequency?

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?