Review questions, Nov 15

Work on the following questions before Nov 15 class.

 

1. The hair color and eye color genes are linked In a particular species of mammal.  Black hair (B) is dominant to green hair (b), and red eyes (R) are dominant to white eyes (r).  When a BbRr individual is mated with a bbrr individual, the observed distribution of offspring was: black-red 1,070; black-white 177; green-red 180; green-white 1,072.  What is the recombination frequency?

 

 

 

 

2.  Based on the table below, predict the physical map of genetic loci A, B and C.

 

genetic loci	recombination frequency (%)
A and B	10
B and C	15
A and C	5

 

 

 

 

3. Red-green color blindness is sex-linked recessive genetic disorder.  When a color blind man is married to a woman with normal vision, what is the probability of their male or female child being color blind?

 

i) Predict the probability when the woman is a carrier of the color blindness allele. 

 

 

 

 

 

 

 

 

 

 

ii) Predict the probability when the woman is not a carrier of the color blindness allele.