Question

For this Punnett Square, "A" is defined as being the dominant normal allele and "a" is the recessive abnormal one that is responsible for an inherited disorder. If both the mother and father are healthy carriers (Aa), what are the chances that their offspring will have the recessive disorder (aa)? a. 2% b. 25% c. 50% d. 75%

Answer 1

I absolutely love genetics!!  Okay the answer is b.  Because if you match it it will look like this.  AA, Aa, Aa, aa.  And there are four choices, and one is homozygous recessive, which is the aa.  And 1/4 is 25% so it's B!!!!