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:

Species Specific

Characteristics or behaviors that are unique to a particular species.

Hybrid Inviability

A postzygotic barrier where offspring resulting from the mating of two different species die prematurely due to genetic incompatibilities.

Alloploid

An organism having two or more sets of chromosomes that are derived from two different species.

Chromosomes

Proteinous, string-like entities situated in the cell nucleus of animals and plants, containing a single DNA molecule.