3.21: Understand that the Sex of a Person is Controlled by One Pair of Chromosomes, XX in a Female and XY in a Male

The 23rd Chromosome of Each Sex Cell Determines the Gender:

• Two X Chromosomes Makes a Person a Female (XX)

• One X and One Y Chromosome Makes a Person a Male (XY)

GENDER DETERMINATION OF OFFSPRING:

GENDER DETERMINATION OF OFFSPRING

Diagram Showing the Chromosomes Carried in Each Sex Cell

EXPLANATION: Egg Cells will Only Carry X Chromosomes Half of Sperm Cells will Carry X Chromosomes, Other Half will Carry Y Chromosomes Sperm Cell (Male Gamete) Determines the Gender of the Offspring as they can Carry Either Chromosomes to Produce a Male or a Female