Question

2. Which of the following must be true of their individuals if two populations are no longer the same species? (Points : 1)
They do not have any of the same genes.
They do not share any of the same space.
They do not resemble each other at all.
They cannot reproduce successfully with each other.

Answer 1

i think its D but im not sure

Answer 2

Since the question says "no longer" , so I assume that they are originally the same species.
So if they are originally same species, they must be resemble each other. And for some reasons, they got separated and resulted in 2 different species.
Do you have other guess?

Answer 3

I was correct with the answer i put thanks for answering. i was just trying to make sure.

Answer 4

oh actually sorry, looked at the wrong one
I thought u says they dont resemble each other

Answer 5

And yes, my answer is also the last one :)

Answer 6

I agree, that's the right answer. But... just to blow your mind... http://en.wikipedia.org/wiki/Ring_species

Answer 7

Calliope, I am thinking, if the species is close enough, they should be able to interbreed?

Answer 8

On the first question, I'd have to say the 4th option. While interspecial reproduction can occur, as in the example of a horse and donkey producing a mule, the mule is generally sterile. Since the mule is not a fertile offspring, the reproduction would not be considered successful. That is an example of only one of several kinds of reproductive barriers between species.

Answer 9

It is really really difficult to actually define where one species ends and another begins. The whole "two populations that cannot breed and produce viable, fertile offspring" thing is a reasonable simplification, but... then there are ring species. And species that generally produce infertile offspring when they mate, but through a quirk of genetics, can occasionally produce fertile offspring. And populations that are technically one species in that they COULD breed successfully, but they live on different continents and look different so are usually classified as being different species...

Oh, and plants ruin everything with all their hybridising.

It's actually been ages since I learned about any of this, and what I just typed up is basically what I learned in my first semester at uni, so I'm sure others on here could give a lot more information.