13. Mendelian Genetics
Pedigrees
Multiple Choice
Multiple ChoiceA man has a pointed frontal hairline known as a widow's peak. This trait is thought to be controlled by a dominant allele. His wife lacks a widow's peak, and their son has a widow's peak. (W: widow's peak; w: no widow's peak). The son is curious about whether his father is homozygous or heterozygous for the widow's peak trait. Which of the following facts would allow him to know?
A
Both his paternal grandfather and his paternal grandmother have widow's peaks.
B
The son's sister has a widow's peak.
C
The son's own daughter lacks a widow's peak.
D
The son submits his own blood sample to a local genotyping lab, and it establishes that he is heterozygous for the trait.
E
His father's mother lacks a widow's peak.
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