(Solved) Help Understanding Homework

sliss14

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11 years ago

Help Understanding Homework

I am having trouble understanding my AP Biology homework, I hope someone can help me Slight Smile

16.   If populations within a common area split into species, the process is known as
A.   sympatric speciation.
B.   allopatric speciation.
C.   racial speciation.
D.   ecotypical speciation.
E.   reproductive speciation.

25.   The isolating mechanism that prevents hybridization between horses and donkeys is
A.   behavioral.
B.   prevention of gamete fusion.
C.   prezygotic.
D.   postzygotic.
E.   natural selection.

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bio_man

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sliss14 Author

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11 years ago

Thank You!

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bio_man

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Educator

11 years ago

Quote from: sliss14 (11 years ago)

Thank You!

You're welcome.

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ipodps3

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11 years ago

Quote from: bio_man (11 years ago)

Quote from: sliss14 (11 years ago)

Thank You!

You're welcome.

You could be wrong for 22 Confounded Face

"Hybrid sterility: This is a type of a postzygotic isolating mechanism. For example, the mule is a hybrid between a donkey and a horse or pony. The diploid chromosome number in the donkey is 62 and in the horse or pony it is 64. The mule therefore has 63 chromosomes and is infertile."

I'm saying it's D.

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bio_man

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11 years ago

Ok, thanks for pointing that out Smiling Face with Glasses

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napalmgrenade

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11 years ago

16)A 25)D I have a test on this today! Yeah sympatric speciation is when you have organisms in the same area but split into species due to some reason. The garter snake comes to mind, which has two similar species but one lives in the water and one lives on land so they can't interbreed. Temporal isolation, pre/postzygotic isolation, mechanical isolation are some other potential reasons. 25 is D because Horses and Donkeys can breed mules, but the mules are sterile, so its a postzygotic barrier.

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bio_man

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