Sex Determination in Humans
Sex Determination in Humans
Sex Determination in Humans
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<strong>Sex</strong><br />
<strong>Determ<strong>in</strong>ation</strong> <strong>in</strong><br />
<strong>Humans</strong><br />
Chromosomes and Human<br />
Genetics<br />
11.3
11.3 In Question<br />
List all the possible mechanisms for genetic<br />
recomb<strong>in</strong>ation of alleles.
III. <strong>Sex</strong> <strong>Determ<strong>in</strong>ation</strong> <strong>in</strong> <strong>Humans</strong><br />
A. Karyotype analysis reveals:<br />
1. All normal human eggs carry only one X chromosome.<br />
2. Half of the sperm carry an X, the other half carry a Y.
B. Gender of human offspr<strong>in</strong>g are determ<strong>in</strong>ed thus:<br />
1. If an X-bear<strong>in</strong>g sperm fertilizes an X-bear<strong>in</strong>g egg, a female<br />
results.<br />
2. If a Y-bear<strong>in</strong>g sperm fertilizes an X-bear<strong>in</strong>g egg, a male results.<br />
C. The Y chromosome carries a male-determ<strong>in</strong><strong>in</strong>g gene that is Yl<strong>in</strong>ked.
8 Week Embryo
D. There are also genes on the sex chromosomes that code for<br />
nonsexual traits.<br />
red-green color bl<strong>in</strong>dness<br />
hemophilia
Out<br />
Which sex would an <strong>in</strong>dividual with XXY sex chromosomes be?<br />
a. female<br />
b. male<br />
c. both<br />
d. neither<br />
e. impossible to tell
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