1. In the following pedigree, the filled symbols indicate individuals expressing

Question

1. In the following pedigree, the filled symbols indicate individuals expressing a rare
genetic disorder.

a. Is the disease phenotype dominant or recessive?

b. Is the disease phenotype likely to be autosomally linked, X-linked, or Y-linked?

c. Based on your answers for (a) and (b), what is the most likely genotype of
individual III-10?

2. The ability to curl one?s tongue into a U-shape (Q) is dominant to noncurlers (q). A curler woman

has a father who is a noncurler. She has five children with a noncurler man. What is the probability that four children are curlers and the other is a noncurler?

3. Your lab is investigating the genetics of a new species of beetle. You have isolated a truebreeding

line that has blue bodies and short antennae, and another with green bodies and long

antennae. Crossing these lines yields F1 progeny with blue shells and long antenna. The F1

progeny were then crossed with beetles that have green bodies and short antennae, yielding the

following progeny:

Progeny phenotype Count

Blue body, long antennae 35

Green body, short antennae 25

Blue body, short antennae 74

Green body, long antennae 66

Total 200

Calculate the recombination frequency between these loci. Show your work.

Explanation / Answer

a. recessive

b. y- linked

c. y-linked dominant

2. 3:1

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