Problem

Solutions For An Introduction to Genetic Analysis Chapter 3 Problem 19P

Step-by-Step Solution

Solution 1

The two mating types and are present in the haploid yeast Saccharomyces cerevisiae. An organism of a purple strain of mating type is crossed with an organism of a white strain of mating type ◊◊

Step #2 of 5

When and are alleles of a single gene, and and are alleles of another independent gene, the progeny expected will be according to the principles of independent assortment of haploid organisms.

Step #3 of 5

The genotypes of the parents are as follows:

The genotype of the diploid formed after crossing both parents:

Step #4 of 5

The progeny is calculated according to the principles of independent assortment in haploid organisms. In a heterozygous diploid, four spores of one type and four spores of another type are formed in the octad. Since it is a haploid organism, it contains only the haploid number of genes and chromosomes.