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Gender
Role of Hormones and Chromosomes
Role of Chromosomes
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How do chromosomes affect sex and
gender
?
Chromosomes
are made from
DNA
Genes
- sections of DNA that determine characteristics of living things
23rd
pair of chromosomes determine
biological
sex
Males =
XY
Females=
XX
A baby's sex is determined by the sperm that fertilises it as it brings an X or Y chromosomes to the eggs' X chromosome
Y chromosome carries a 'sex determining region' (
SRY
)
SRY causes development of testes in XY embryos which produce
androgens
(male sex hormones)
Presence of
androgens
= male. No androgens present = females