EVOLUTION
PATTERNS OF EVOLUTION
|
Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
|
|
|
a small number of individuals moves and starts a new population.
|
|
|
some catastrophic event greatly reduces the size of a population.
|
|
|
the gene pools of different populations have become very diversified.
|
|
|
members of different populations can no longer mate successfully.
|
Detailed explanation-1: -Broadly speaking, different species are unable to interbreed and produce healthy, fertile offspring due to barriers called mechanisms of reproductive isolation. These barriers can be split into two categories based on when they act: prezygotic and postzygotic.
Detailed explanation-2: -Reproductive isolation occurs when a population splits into two groups and the two populations no longer interbreed. When populations become reproductively isolated, they can evolve into two separate species.
Detailed explanation-3: -Random processes such as mutation and genetic drift can also effect evolution. When members of two isolated populations can no longer successfully mate, the populations are said to be reproductively isolated. Reproductive isolation is the final step prior to speciation, which is the evolution of a new species.
Detailed explanation-4: -Reproductive isolation is defined as “the inability of a species to breed successfully with related species due to geographical, behavioral, physiological, or genetic barriers or differences."