Just the facts on what determines male or female:


Go to Google and type in chromosomes

Human Karyotype graphic


Which chromosome is female?
two X chromosomes

Females have two X chromosomes, while males have one X and one Y chromosome. Early in embryonic development in females, one of the two X chromosomes is randomly and permanently inactivated in cells other than egg cells.

Sex chromosomes

Scientists have numbered the chromosome pairs from 1 to 22, with the 23rd pair labeled as X or Y, depending on the structure. The first 22 pairs of chromosomes are called autosomes. The 23rd pair of chromosomes are known as the sex chromosomes, because they decide if you will be born male or female.

Two sexes

Based on the sole criterion of production of reproductive cells, there are two and only two sexes: the female sex, capable of producing large gametes (ovules), and the male sex, which produces small gametes (spermatozoa).

How Chromosomes Determine Sex

How chromosomes determine sex


10 Facts about chromosomes

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