Genetics Crossing Dominant and true breeding

1. 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?

2. 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