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

question 144

Multiple Choice

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.

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Definitions:

CGG Sequences

Specific sequences of DNA nucleotides comprising cytosine and guanine, often studied for their role in genetic diseases.

Genomic Imprinting

A biological occurrence where specific genes are manifested based on which parent they are inherited from.

Polyploidy

The condition of having more than two complete sets of chromosomes, common in plants and some animal species.

Chromosomes

Structures within cells that contain genetic information (DNA) organized into genes.