While doing a pedigree analysis of a royal family from the ancient Mayan empire, you notice that a prince with the genetic disease married a person from outside the royal family without a history of the disease in her family. Of their six children, two have the disease and four are not affected. The prince's mother and father also had this disease. If this disease is controlled by a single gene, then the MOST likely explanation for disease in the children would be that the disease is:
A)a spontaneous mutation.
B)recessive and is only seen in homozygous recessive individuals such as the two affected children.
C)dominant and is only seen in homozygous dominant individuals.
D)dominant and is seen in heterozygous or homozygous dominant individuals.

Question

Quizplus · Accepted Answer

The disease is likely dominant because the prince, who has the disease, married someone without a history of the disease, and some of their children are affected. This suggests that the prince is heterozygous for a dominant allele, which he passed to the affected children.

While Doing a Pedigree Analysis of a Royal Family from the Ancient