Inheritance
CHROMOSOMES & GAMETES
Your cells have autosomes and sex chromosomes.
• Human body cells have 23 pairs of
chromosomes.
– Homologous chromosomes are
pairs with the same structure and
kind of info.
– For each homologous pair, one
chromosome comes from each
parent.
• Chromosome pairs 1-22 are
autosomes.
• Sex chromosomes, pair #23,
determine gender in mammals.
SELECTION
NATURAL SELECTION