Sex
Chromosomes
Sex Chromosomes
 Determines
the sex of the
individual
 Female has two identical X
chromosomes (XX)
 Male has dissimilar chromosomes
◦ One X and one Y (XY)
Autosomes
 Chromosomes
that are not
sex chromosomes
 Have no effect on determining
the sex of the individual
 How many pairs of autosomes
do humans have?
Sex Determination
 Which
parent is responsible
for determining the sex of the
offspring?
 The father because he has
both the X and the Y
chromosomes
Genes on Sex Chromosomes
 Genes
located on sex
chromosomes are sex-linked
 What are some traits that are
sex-linked?
Sex-Linked Traits
Colorblindness
Hemophilia
Muscular
Dystrophy