Question

Why does Natural Selection act primarily on the phenotype of an organism? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ?

Answer 1

\(\huge\text{MOAR ?s PLIX}\)

Answer 2

lol help me now...

Answer 3

please ill give u a hundered medals. i swear. to god. and im muslim. so i keep my swear. no matter what(:

Answer 4

The genotype is the sum total of all the genes in an organism. But not all of those genes are *expressed*. The phenotype is that subset of the genes that are expressed. Since unexpressed genes provide neither advantage nor disadvantage ... natural selection cannot act on unexpressed genes ... only on expressed genes (the phenotype).

Reproductive and geographic isolation is when a a subpopulation gets isolated from other members of its species. Geographic isolation causes reproductive isolation (this is called 'allopatric speciation') but there are also ways that members of the same species might not be geographically isolated, but are still reproductively isolated (e.g. if members of a species begin specializing in two different niches in the same geography ... say one takes to the small nuts in the high branches, and the other takes the larger nuts that fall to the ground.

In either case, if the two subpopulations do not interbreed or are geographically separated so they can't interbreed, then enough genetic changes will accumulate to where they are biologically unable to reproduce together (and produce fertile offspring). At that point the two subpopulations are technically two species (unable to interbreed) ... so speciation has occurred.

Answer 5

Thankyouuu!!!!! you have to help me on my bio test next friday k??

Answer 6

Lol. Ok.

Answer 7

Nice answer

Answer 8

yup it is a nice answer :)