Chapter 5, Problem 36P

Divide a clean sheet of paper into four quadrant and draw one pair of homologous chromosomes in each quadrant. Draw the chromosomes with two sister chromatids each. The four sets of homologous pairs are identicle. Label one chromosome of each pair with alleles $\text{A1}$ and $\text{B1}$ and the other members of ach pair with the alleles $\text{A2}$ and $\text{B2}$. You are to illustrate a single crossover between the homologs in each quadrant, and list the parental and recombinant chromosomes, but you are to illustrate four different ways the crossover can occur by involving different chromatids in each illustartion.