The sexual reproduction produces variations in the next generation. No two individual resulting from separate fertilizations are genetically identical. The main sources of variations in sexually reproductions are described next.
· The genetic recombination produced through crossing over result in gametes with variation.
· Mutations are important source of variations. Mutations also happen during gametes formation through meiosis.
· During fertilization, one of the millions of sperms combines with a single egg. The chance involved in this combination also act as the source of variations.
· Gene flow i.e. movement of genes from one population to another is also an important source of variations.
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