Variation in a Species
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Uploader Comments (khanacademy)
Top Comments
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i wish i discovered ur vids BEFORE i finished bio.. T________T
btw ur very good at explaining bio+chem. :)
1 year ago 28
All Comments (68)
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@Aleksi535 Why was this comment removed????
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@GollaGandaLova Well, I am a biologist! And I don't know what you're regarding to. I think he does a great job at teaching and that people like him should start their own schools and teach!
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I thought he said the germ cells don't contain chromosomes. Then how can he donate 1 chromosome from either his mom or dad from his germ cells to fertilize the ova?
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If evolution actually happened, why is all DNA degenerating today? Evolution is quack science.
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At the end of every lecture, only 1 thought comes to mind: Mind Blowing. Just wow.
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The theory of evolution has NEVER led to "another species" by this process. See: net4truthusa - dot com and click on the book "Neogenesis" The theory of evolution does NOT pass the empirical test of science - it is a State-sponsored pagan religion.
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@Aleksi535 No one careS? Sal is trying to show us the basic ideas. Not turning us into scientists or biologists.
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I have a question sal. Does sexual reproduction created new genes? If not, then mutation is the ultimate source of variation becasue sexual reproduction merely help recombine and spread out the genes within a population. Thanks
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this video totally help me in my studies . thanks, sir :)
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Hey Sal. I think the analogy to a computer program was a little off. From my understanding, if you introduce a random mutation it won't usually break the whole organism, only that protein. This is because of the start and stop codons.
armpitpuncher 2 years ago 10
Depends on how drastic the mutation is and how important that gene/protein is to the organism. To your point, however, DNA does have more redundancy and fault tolerance than most computer programs (and is far, far, far more complex)
khanacademy 2 years ago 28