Widow's peak, a pointed hairline on the forehead, is a genetic trait caused by a dominant allele. It can be traced back through a family's history using pedigree analysis.
The pedigree shown here is of three generations of a family. Notice that some individuals (shown in gray)have a widow's peak (W = dominant allele and w = recessive allele).
-This pedigree supports the fact that widow's peak is due to a dominant allele, because if it were due to a recessive allele and both parents show the recessive phenotype, then ________.
A)half of the sons would have a widow's peak
B)all of the offspring would have a widow's peak
C)none of the daughters would have a widow's peak
D)all of the daughters and none of the sons would have a widow's peak

Question

Widow's peak, a pointed hairline on the forehead, is a genetic trait caused by a dominant allele. It can be traced back through a family's history using pedigree analysis.
The pedigree shown here is of three generations of a family. Notice that some individuals (shown in gray)have a widow's peak (W = dominant allele and w = recessive allele). 
-This pedigree supports the fact that widow's peak is due to a dominant allele, because if it were due to a recessive allele and both parents show the recessive phenotype, then ________.
A)half of the sons would have a widow's peak 
B)all of the offspring would have a widow's peak 
C)none of the daughters would have a widow's peak 
D)all of the daughters and none of the sons would have a widow's peak

Quizplus · Accepted Answer

The Answer of Widow's peak, a pointed hairline on the forehead, is a genetic trait caused by a dominant allele. It can be traced back through a family's history using pedigree analysis.
The pedigree shown here is of three generations of a family. Notice that some individuals (shown in gray)have a widow's peak (W = dominant allele and w = recessive allele). 
-This pedigree supports the fact that widow's peak is due to a dominant allele, because if it were due to a recessive allele and both parents show the recessive phenotype, then ________.
A)half of the sons would have a widow's peak 
B)all of the offspring would have a widow's peak 
C)none of the daughters would have a widow's peak 
D)all of the daughters and none of the sons would have a widow's peak

Widow's Peak, a Pointed Hairline on the Forehead, Is a Genetic