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Solutions For An Introduction to Genetic Analysis Chapter 4 Problem 69P

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Solution 1

In haploid yeast, two different cultures are given which need arginine supplemented in minimal media. After the two cultures mate, the diploid cells divide meiotically to form unordered tetrads. Some of the ascospores formed grow on minimal media. The tetrads are recorded according to their requirement of arginine:

Step #2 of 3

a) The data shows the presence of two genes. Giving symbols of arg1 and arg2, the cross of two different cultures are:

arg1; arg2⁺ x arg1⁺; arg2

The resulting tetrads are:

Step #3 of 3

b) Yes, there is more than one loci governing arginine requirement. The above results show that the genes undergo independent assortment and are not linked.

Since, PD = NPD, the genes are not linked.

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