I remember once my high school teacher said when the sperm fertilizes the egg the genes are mixed very randomly, is that true?


closed as off-topic by rg255, James, MattDMo, fileunderwater, The Last Word Mar 24 '16 at 4:33

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  • $\begingroup$ It is rather wrong! Segregation and recombination both occur at the moment of the formation of the gametes (meiosis) and not at the moment of the fertilization. You might want to have a look at the wiki articles for meiosis, recombination and segregation. $\endgroup$ – Remi.b Mar 22 '16 at 5:21
  • $\begingroup$ Your question is unclear. Perhaps you should clarify with your teacher about what exactly they wanted to say. Or otherwise you should clarify what you really mean by "mixing"? Sure, because of diffusion, the paternal and maternal chromosomes would be uniformly distributed in the nuclear space. $\endgroup$ – WYSIWYG Mar 22 '16 at 8:14

No. When sperm and ova are forming, the chromosomes you inherited from your mother lines up with the chromosome you inherited from your father, and "crossing over" happens. It would be like taking a Merriam-Webster dictionary, and another brand of dictionary, and picking a random point (like say, the middles of the "C" section), cutting both books at that point, and joining the portion of one with the portion of the other, making new books that are part Merriam Webster, and part the other kind of dictionary. That happens in every chromosome, and the gamete is made up of those franken-chromosomes.


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