Download Notes: Sex-Linked Traits

Notes: Sex-Linked Traits
Sex determination:
XX x XY
Sex-linked genes:
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Genes only found on the X chromosome are called
_______________.
Genes only found on the Y chromosome are called
_______________.
Sex-linked traits in humans:
Example 1:_____________ is caused by a X-linked recessive allele,X .
Phenotypes
Female with normal vision
Genotypes
Female who is colorblind
Female who is a carrier for colorblindness
Male with normal vision
Male who is colorblind
Can a male have normal vision, but still be a carrier for
colorblindness?
Example 2: _____________is also a disease that is X-linked. The
blood of a person who has hemophilia does not clot properly. This
means that small cuts and scrapes can lead to massive bleeding.
Phenotypes
Normal female
Female who has hemophilia
Female who is a carrier for hemophilia
Normal male
Male with hemophilia
Genotypes