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Explain sex determination in humans with a neat labelled diagram.
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Sex is determined by genetic inheritance in human beings. Genes inherited from parents determine whether the offspring will be girl or boy. There are two sex chromosomes in human beings X and Y chromosome, the male contributes XY chromosomes and females contribute XY chromosome. If a sperm with X chromosome fertilises with an ovum having X chromosome then it will be a girl. If a sperm carrying Y chromosome fertilises with an ovum having X chromosome then it will be a boy.
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