Biological Sex Isn't a Choice

The X and Y chromosomes determine biological sex.
Dec 4, 2020
Biological Sex Isn't a ChoiceBiological Sex Isn't a Choice
All mammals have their biological sex determined by chromosomes, which are made up of DNA. "DNA contains the specific instructions that make each type of living creature unique," explains the National Human Genome Research Institute. Humans in particular have 46 paired chromosomes, each of which determine different biological traits. Our chromosomes determine everything from Down syndrome to biological sex. The 23rd pair of chromosomes in humans are the sexual biology chromosomes. When an egg is first fertilized, a chromosome from the sperm cell joins a chromosome from the egg cell, determining the fetus's biological sex. While there are some exceptions, the vast majority of women have two X chromosomes, and most men have an X and a Y chromosome. The Y chromosome induces the male phenotype (the observable trait of male biological sex) long before birth.
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John agrees with this fact based on:
Chromosomes Fact Sheet

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