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 
- males have two different sex chromosomes, X and Y 
- females have two X chromosomes, XX 
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