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The Haploid-diploid Cycle of Sexual Reproduction

   Copyright 2004 by Alberts, Bray, Johnson, Lewis, Raff, Roberts, Walter.
Garland Publishing: Taylor Francis Group.

The Haploid-diploid Cycle of Sexual Reproduction


Sexual reproduction involves both haploid and diploid cells. (A) Cells in higher eucaryotic organisms proliferate in the diploid phase to form a multicellular organism; only the gametes (the egg and the sperm) are haploid. (B) These gametes reunite at fertilization to generate a diploid zygote, which will develop into a diploid organism. For simplicity, only one chromosome is shown for each gamete, and the sperm cell has been greatly enlarged.  Fair Use and Copyright info

 
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