The following question(s) refer to the pedigree chart in the accompanying figure for a family, some of whose members exhibit the dominant trait, W. Affected individuals are indicated by a dark square or circle.
-What is the likelihood that the progeny of IV-3 and IV-4 will have the trait?

Question

The following question(s) refer to the pedigree chart in the accompanying figure for a family, some of whose members exhibit the dominant trait, W. Affected individuals are indicated by a dark square or circle. 
-What is the likelihood that the progeny of IV-3 and IV-4 will have the trait?

Quizplus · Accepted Answer

IV-3 is affected and IV-4 is unaffected, which means that IV-3 must be heterozygous for the trait since the trait is dominant. IV-4 could either be homozygous recessive or heterozygous. Therefore, the chances of their progeny inheriting the trait are 50 percent.

The Following Question(s) Refer to the Pedigree Chart in the Accompanying