X-Linked Disorders

X-Linked Recessive Inheritance has these characteristics: Color blindness is an example of an X-linked recessive trait that is not very serious.

This three generation pedigree for color blindness demonstrates some of the distinctive characteristics of an X-linked recessive trait. These include:

A serious X-linked recessive condition is hemophilia A , the inability of the blood to clot because the genes do not code for the necessary clotting agent(s). It was common in the European royal families. .

Fragile X syndrome is a recessive disorder that causes mental retardation in males. There is a mutant allele (with repeated segments of DNA) for a gene that specifies a protein required for brain development.

This animation (No Audio) describes x-linked disorders.

REVIEW: Hemophilia
a. is rare in the human population.
b. is more common among men.
c. was common in English royalty.
d. is an X-linked recessive trait.
e. all of these

REVIEW: Genetic disorders are caused by _____ .
a. altered chromosome number
b. altered chromosome structure
c. mutation
d. all of the above

REVIEW: A recognized set ot symptoms that characterize a specific disorder is a _____ .

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