Meiosis 7- Random fertilization


– Okay, so now we have crossing
over that results in diversity. We have independent assortment
that results in diversity, and then think about the fact that even if we
didn’t cross over and we had eight
million possible eggs that I could make
and the fellows have eight million possible sperm
that they could make. Not only do we have all of
that diversity, we then have randomly, you are going
to get different kids, depending on which gametes get
fertilized by who. So check it out.
If you have this little, this sperm was the lucky sperm, that made it to this egg, you’re going to end up
with a fertilized zygote that has genetics
that look like this. If you randomly
pick a different set of eggs and sperm,
check that out. We’re going to end up
with different zygotes. Here are all my possible zygotes
from just four possible sperm, and four possible eggs. It really is kind
of mind boggling. That’s it. Actually– I mean it’s super mind boggling
but it’s pretty straightforward. And random fertilization isn’t
a process of meiosis. Meiosis produces the gametes
that then random fertilization is going to produce
the genetic diversity which, hopefully,
you’re like why do we care? We’ll have a fatty explanation of that why we care
about genetic diversity when we get to the last
lecture in the series which is on sexual reproduction, oh, and parasites. That’s why we care about genetic
diversity. Trust me. All right, let’s do an animation
walk-through of the process of meiosis just to remind
ourselves where we are. Now you know why we do it, so that we can generate
genetic diversity, and have the right amount
of DNA. Review.

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