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Inheritance of biological gender





Human body cells have 23 pairs of chromosomes in the nucleus.

One of these pairs controls the inheritance of biological gender (whether offspring are male or female) [1]

Genetic diagram

A genetic diagram shows how chromosomes or alleles may combine in zygotes.

The diagram below shows how biological gender is inherited.

The ratio of female to male offspring is 1:1 – on average, half of the offspring will be girls and half will be boys.

The two possible combinations are:

- producing a girl - an X chromosome from the mother and an X chromosome from the father

- producing a boy - an X chromosome from the mother and a Y chromosome from the father [2]

Male chromosomes

- males have two different sex chromosomes, X and Y [3]

Female chromosomes

- females have two X chromosomes, XX [4]






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