Why Are X-Linked Recessive Genetic Disorders More Commonly Seen in Males

question 37

Multiple Choice

Why are X-linked recessive genetic disorders more commonly seen in males?

• A) For an X-linked disorder to occur, an individual must receive one allele only found on the X chromosome and a second allele found only on the Y chromosome, which females do not have.
• B) Females must receive two copies of the recessive allele to exhibit the disorder, but males need only one copy.
• C) The alleles of sex-linked genes are carried only on the Y chromosome, which females do not have.
• D) Females only have X chromosomes, and genes on the X chromosome are not expressed.

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Definitions:

Enantiomers

Molecules that are mirror images of each other but cannot be superimposed on each other, often exhibiting different properties in a chiral environment.

Diastereomers

Stereoisomers characterized by having distinct physical properties and not being mirror reflections of one another.

(2R,4R)-2,4-dibromopentane

A chiral compound with a specific configuration, indicating the presence of bromine atoms on the second and fourth carbon of a five-carbon chain.

Fischer Projection

A method of drawing organic molecules by projecting a three-dimensional molecule onto a two-dimensional plane.