see attached

Genetics Problems Part 2

Name ______________________

Sec. ____________

1. In Woozles (a pretend animal) it has been discovered that the genes for fur color (A = purple, a = yellow), tail shape (B = curly, b = straight), wing size (C = long, c = short), and ear shape (D = pointed, d = floppy) are all on the same chromosome (linked). Your job is to map genes A, B, C, and D which are all found on the same chromosome (linked) using the resulting phenotypes of offspring from the various crosses given below. Mark the genes and distances between them on the gray chromosome shown below.

Cross Offspring phenotypes

AaBb x aabb ( 92 – purple/curly, 94 – yellow/straight, 8 – purple/straight, 6 – yellow/curly

AaCc x aacc ( 34 – purple/long, 33 – yellow/short , 17 – purple/short, 16 – yellow/long

AaDd x aadd ( 40 – purple/pointy, 38 – yellow/floppy, 10 – purple/floppy, 12 – yellow/pointy

BbCc x bbcc ( 62 – curly/long, 58 – straight/short, 36 – curly/short, 44 – straight/long

BbDd x bbdd ( 35 – curly/pointy, 36 – straight/floppy, 15 – curly/floppy, 14 – straight/pointy

CcDd x ccdd ( 45 – long/pointy, 44 – short/floppy, 6 – long/floppy, 5 – short, pointy

2. A man with hemophilia has a daughter of normal phenotype. She marries a man who is normal for the trait. What is the probability that a daughter of this mating will be a hemophiliac? That a son will be a hemophiliac? If the couple has four sons, what is the probability that all four will be born with hemophilia?

3. A color-blind man marries a woman with normal vision whose father was color-blind. What is the probability that they will have a color-blind daughter? If the couple has a son, what is the probability that he will be color-blind?