Homework Assignment #6

1. Assume coupling linkage for a testcross.
   AaBb x aabb Testcross progeny.
   
   a) Show that the probability of the Aabb progeny
        is 1/2(p) using a Punnett square.
   
   b) What is the probability of an Aabb testcross
       progeny when p = 1/4?
   
   c) What is the probability of an aaBb testcross
       progeny when p = 1/2?
   
   
2. Assume coupling linkage and F₂ data from the cross AaBb x AaBb.
   
   a) Show that the probability of the aaB_ class of
       progeny is (2-p)p/4.
   
   b) What is the probability of the aaB_ class of
   b) progeny when p = 0.2?
   
   c) What is the probability of the aaB_ class of
       progeny when p = 0.5?
   
   d) What is the probability of aaBb progeny when
       p = 0.2?
   
   
3. The following F₂ data was observed. The Chi-square test results were:
   

   Ho 3:1 for A locus. Fail to reject Ho.
   Ho 3:1 for B locus. Fail to reject Ho.
   Ho: Independence for A and B loci. Reject Ho.
   

a) Is this coupling or repulsion data?

b) Estimate 'p' using the product method and
    Immer's table (pg. 88).

c) Find the standard error of the estimate of p.