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Humans have 23 pairs of chromosomes. - One pair is called a sex chromosome - For females it's "XX" - For males it's "XY" - The other 22 pairs are called autosomes, which determine the rest of your body

Genotype Environment Interactions Passive: Both genetic traits and environment are present from the start. Evocative: Social environment reacts to genetic traits. Active: Individual seeks out environment that supports genetic traits.