In humans, having more than five fingers or toes is dominant over having exactly five finger or toes. Which of the following situations would most likely result in exactly half of a couple's offspring having six digits and half of them having five?

Question

In humans, having more than five fingers or toes is dominant over having exactly five finger or toes. Which of the following situations would most likely result in exactly half of a couple's offspring having six digits and half of them having five? 
A.Both parents are homozygous for the recessive trait 
B. Both parents are heterozygous 
C. One parent is heterozygous while the other is homozygous for the recessive tratit.
D. One parent is homozygous for the recessive trait while the other is homozygous for the dominant trait. 
Is the answer a?

PsyDAG · Answer

No, if both parents homozygous recessive, all offspring will be recessive.

Use Punnett square.

https://www.google.com/search?client=safari&rls=en&q=punnett+square+worksheet&ie=UTF-8&oe=UTF-8&gws_rd=ssl