A Man and Woman Are Both of Normal Pigmentation and Have

question 21

Multiple Choice

A man and woman are both of normal pigmentation and have a one child out of three who is albino (without melanin pigmentation) .Albinism is an autosomal (not sex-linked) recessive trait.What are the genotypes of the albino's parents?

• A)One parent must be homozygous for the recessive allele;the other parent can be homozygous dominant,homozygous recessive,or heterozygous.
• B)One parent must be heterozygous;the other parent can be homozygous dominant,homozygous recessive,or heterozygous.
• C)Both parents must be heterozygous.
• D)One parent must be homozygous dominant;the other parent must be heterozygous.
• E)Both parents must be homozygous dominant.

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Definitions:

Papillae

Projections on the surface of the tongue that contain taste buds, involved in the sensation of taste.

Ileocecal Sphincter

A muscular valve that controls the flow of digested food from the small intestine to the large intestine.

Ileum

The final and longest segment of the small intestine, where the absorption of vitamins, electrolytes, and other nutrients is completed.

Cecum

The first part of the large intestine, connected to the ileum and ascending colon, playing a role in the digestive process.