Question

QUESTION 1

1. Human blood has multiple alleles. If a person that is heterozygous for Type A is crossed with a type O person, the offspring would be expected to show a phenotypic ratio of

   		3 type O:1 type A
   		3 type A:1 type O
   		1 type A:1 type B:1 type AB:1 type O
   		2 type A:2 type O

2 points   

QUESTION 2

1. If a color-blind man marries a woman who is homozygous for normal vision, it is possible that one of their sons could be color-blind.

   True

   False

2 points   

QUESTION 3

1. DNA profiling can be used to trace the evolutionary history of organisms.

   True

   False

Answer 1

1.) D---- 2 type A : 2 type O

Tybe 0 01 しし Type A L

2.) FALSE ,

Because color blindness is X linked recessive trait , in this case affected makes result from mother's who are affected or carriers.

3.) TRUE.