380F11SolnPS4

# 380F11SolnPS4 - 01:447:380 Fall 2011 SOLUTIONS TO PROBLEM...

This preview shows pages 1–2. Sign up to view the full content.

01:447:380 Fall 2011 SOLUTIONS TO PROBLEM SET 4 Additional Problems 1. Since the genes at A and B loci assort independently, we can treat each one separately. Let’s look at the A’s first…. Aa x Aa ¼ AA, ½ Aa, ¼ aa. Now let’s look at the B’s….. Bb x Bb ¼ BB, ½ Bb, ¼ bb. Now we can answer the questions using the multiplication rule to combine these probabilities. A) 3/16; p(Ab phenotype) = p(A_ and bb) = ¾ x ¼ B) 82; p(Ab phenotype) = p[(AA genotype and shows A_ phenotype) or (Aa genotype and shows A_ phenotype)] and (bb genotype and shows bb phenotype) = [( ¼ x 0.85) + (1/2 x 0.45)] x (1/4 x 0.75) = 0.082. We are asked for the total number out of 1000, so we must multiply this probability by 1000 to get the final answer. 2. We are told that the starting strains are true-breeding, so we know that the P o must be homozygous. Now we must figure out how many genes contribute to the phenotype observed. If 1 gene is involved, then it’s a monohybrid cross and we should see phenotypic ratios in the F 2 generation that are divided into 1/4s (i.e. 1:2:1, 3:1, etc).

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}

### What students are saying

• As a current student on this bumpy collegiate pathway, I stumbled upon Course Hero, where I can find study resources for nearly all my courses, get online help from tutors 24/7, and even share my old projects, papers, and lecture notes with other students.

Kiran Temple University Fox School of Business ‘17, Course Hero Intern

• I cannot even describe how much Course Hero helped me this summer. It’s truly become something I can always rely on and help me. In the end, I was not only able to survive summer classes, but I was able to thrive thanks to Course Hero.

Dana University of Pennsylvania ‘17, Course Hero Intern

• The ability to access any university’s resources through Course Hero proved invaluable in my case. I was behind on Tulane coursework and actually used UCLA’s materials to help me move forward and get everything together on time.

Jill Tulane University ‘16, Course Hero Intern