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

question 46

Multiple Choice

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

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Definitions:

Rational Thinking

The process of logical or sound reasoning, often involving critical thinking and the evaluation of facts and information.

Transference

In psychoanalysis, the process by which patients project feelings about important figures in their life onto the therapist.

Approval

The act of agreeing with, accepting, or endorsing something or someone, often officially.

Therapist's

Pertaining to a therapist, often relating to their methods, practices, or interventions used in the treatment of disorders.