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Sex Linked Traits
44 Chromosomes are Autosome Chromosomes. The other 2
chromosomes are sex chromosomes. 46XX Females 46 XY Males
An Example of Inheritance of a sex linked trait in humans is color
blindness
C = normal color vision Allele
ĉ= Color blind Allele
Normal carrier X Xĉ (x)
(Carries recessive allele)
C
Parents
Xc
Y
Xc
C
X Y
Normal
Xĉ
Xc Xc
Xc Xĉ
Xc Y
Xĉ Y
Females have 2 x-chromosomes. Males have an X and Y chromosomes. Sex linked
traits in humans are determined by genes only carried on the X chromosome with no
allele \s on the Y chromosome. Recessive sex linked traits rarely appear in d\females
because dominant allele on one X chromosome will mask the effect of a recessive allele
on the other X-chromosome.
Example: color blindness, hemophilia
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