1. If two genes are linked and 20 map units apart, how many each recombinant type chromosome would you expect in 1000 meioses involving the chromosome in question?
 
2. If I observe 120/500 recombinant offspring in a dihybrid test cross, how many of the 500 offspring observed were of each parental type?

****FOR THE ABOVE TWO QUESTIONS, HOW DOES THE ANSWER CHANGE IF I REMOVE THE WORD "EACH" FROM THE QUESTION.****
 

In the following pedigree. I:1 has crooked teeth and bad hair. I:2 has great hair and great teeth. Their daughter, II:1, has crooked teeth and bad hair, but her husband, II:2 has great hair and great teeth. Of the children of II:1 and II:2, III:1 and III:5 have bad hair and crooked teeth, while III:2 and III:3 have great hair and great teeth. III:4 has great hair and crooked teeth.

1. Which is a recombinant?

a) I:1    b)II:1    c) III:1    d) III:4    e) III:5
 
 

2. What is the chance of the distribution of II:1 and II:2's children given independent assortment?

a) 0.25    b) 1.0    c) 0    d) .000977    e) .008
 

3. What is the chance of II:1 and II:2's children if the genes are linked and separated by 20 map units?

a) 0.25    b) 0.00256    c) 0.000977    d) 0.008    e) 1.0
 

4. What is the LOD score for 20% recombination between the gene affecting hair and the gene affecting teeth?

a) 0.008    b) 000977    c) 0.00256    d) 2.62    e) 0.42