Sexual Life Cycle

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•  The halving of the chromosome number allows a sexual life cycle with fusion of gametes

Most sexually reproducing organisms are diploid, meaning they have two copies of every chromosome (maternal / paternal copy)

  • In order to reproduce, these organisms need to make gametes that are haploid (one copy of each chromosome)

Fertilisation of two haploid gametes (egg + sperm) will result in the formation of a diploid zygote that can grow via mitosis

  • If chromosome number was not halved in gametes, total chromosome numbers would double each generation (polyploidy)

Sexual Life Cycle

sexual life cycle