Problem

Solutions For An Introduction to Genetic Analysis Chapter 4 Problem 32P

Step-by-Step Solution

Solution 1

Step #1 of 2

a) When a mouse undergoes a dihybrid cross. The genotypes of the parents are obtained as follows:

A/a B/b x a/a b/b

The progeny are:

• 25% - A/a B/b

• 25% - A/a b/b

• 25% - a/a b/b

• 25% - a/a B/b

These results might be due to independent assortment, since all the four genotypes are equal in frequency.

The meiosis diagrams would be:

Step #2 of 2

b) A dihybrid cross is made in mouse. The genotypes of the parents are:

C/c D/d x c/c d/d

The progeny are:

• 45% - C/c d/d

• 45% - c/c D/d

• 5% - c/c d/d

• 5% - C/c D/d

The results indicate that these two genes are linked, since the number of recombinants is 10 out of 100. The distance between the two genes is 10 m.u. apart. The recessive alleles are in repulsion.

The meiotic diagrams would be:

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Solutions For Problems in Chapter 4

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