Allopatric and sympatric speciation | Biology | Khan Academy

great video

I don't get how these two examples of speciation fit into the larger basic phenomenon of speciation

Thanks

Wonderful lecture 😀

Thanks for the help, I have an exam tomorrow. lol

bs mjaa aa giyo... 🙏 🙏 🙏 🙏

yes i saw the video!!

Is it possible that a human subgroup that consistently vegan or meat eater for thousands of years would eventually form a new species? If yes, how long would it take the speciation to occur?

You should have taken the example of the wheat to explain this. More over you should explain endoreduplication to show how the allopolyploid species arise.

i have to say i am disappointed that you didn't mention anything about how a tetraploid becomes a hexaploid.

I was wondering do you really need a tetraploid to create a triploid or can it be just one plant with an error mixing with a haploid that can make a triploid

The explanation of the squirrels is not correct. They separated only about 10,000 years ago and the Grand Canyon (which started about six millions years ago) was already an insurmountable barrier by then. It is not like it suddenly appeared in the past few thousand years. More likely is that the original single population lived elsewhere upstream where it was possible to cross the river. The population moved southwards and now the canyon was a barrier that stopped gene flow and led to speciation. The Grand Canyon is a barrier, but the forming of the canyon is NOT what separated this population of squirrels.

U r really good man..I like ur xplaination n writing technique

Why is not a simple gene expression? Why is it evolution? If you can interbread the species it means that you are interbreading variations of the same species.

You can still try to create new variations of dogs... It will still be dogs and not directional selection that is evolution in one direction. As we learn in school.

Does this have any epigene involved in this?

You don't actually explain how speciation happens....

It's amazing how well you write with mouse

thanks budy !

Turkish subtitles?

Great video. Good explanation

Good explanation. Thanx.

Can any one tell me the difference between reproductive isolation in sympatric speciation and allopatric speciation?

so you wanna tell me that plants reproduce using sperm and egg cells😂

thank you, this was very helpful!

Shrkomalumae

+Khan Academy So how do some modern peoples' genomes contain up to 3% Neanderthal DNA? Wouldn't that have to mean that at some point a Homo sapiens and a Neanderthal would have mated to produce a fertile offspring, which was then able to further mate with other H. sapiens? If so, doesn't that question the interbreeding definition of 'species'?

Did the previous "evidence for evolution" get taken down?

In terms of the two types of squirrels, could the difference in geography from the two sides of the canyon really be sufficient in diversifying the two's genes to the point where they were no longer compatible in producing any fertile offspring? The idea seems cloudy to me on this one, on how life on either side of the canyon could be drastically different.