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Sex-Linked Traits
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Slide 1

Sex-Linked Traits

Sex-Linked Traits

Slide 2

Sex-Linked Traits

Sex-Linked Traits

Traits whose alleles are located on sex

chromosomes

X-linked traits are traits whose allele is carried on the X chromosome

Y-linked traits are traits whose allele is carried on the Y chromosome. Most

Y-linked mutations lead to sterility, and can not be inherited.

Slide 3

Sex-linked = X-linked

Sex-linked = X-linked

Because X-linked traits are traits the predominant sex-linked traits, for our purposes:

Slide 4

Color Blindness: An X-linked Recessive trait

Color Blindness: An X-linked Recessive trait

Slide 5

Punnett Square

Punnett Square

XC

XC

Xc

Y

Carrier mother

Unaffected

father

XCXc

XCXc

XCY

XcY

25%

25%

25%

25%

Colorblind male

Slide 6

A Pedigree - Colorblindness

A Pedigree - Colorblindness

Slide 7

Hemophilia: Another X-linked Recessive trait

Hemophilia: Another X-linked Recessive trait

Slide 8

Punnett Square

Punnett Square

XH

XH

Xh

Y

Carrier mother

Unaffected

father

XHXH

XHXh

XHY

XhY

25%

25%

25%

25%

Hemophiliac male

Slide 9

Hemophilia in Europes Royalty

Hemophilia in Europes Royalty

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