Question

Evolution is... a. a shift in allele frequency due to mixing of species b. a change in allele frequency because a selection pressure has caused mutations c. a change in allele frequency because individuals with a particular allele have a selection advantage in a particular environment d. the divergence of traits in different species as a result of the same selection pressure

Answer 1

Evolution is the formation or development of newer organisms or structures by the addition or deletion of certain characters or by modifications of the characters.

This entire process occurs in accordance to some forces.

In the process there is a change in the frequency of alleles responsible for various traits of characters.

This change in the frequency of alleles occurs due to selection advantage in a given particular environment.

Mutations will add changes in the characters, but mutations are not resulted or caused by selection pressure.

Mutations result in changed alleles, but the change in their frequency results due to the selection advantage from the environment.

Thus evolution takes place by change in the frequency of alleles which in turn is resulted by selection advantage from the nature.