Biology

A structure with similar shape but a different use

Artificial Selection Answer Artificial Selection is the breeding of certain traits (better traits) over other traits. For example, breeding a good male horse with excellent racing qualities with a healthy female horse so that the offspring will have the desired traits such as the racing qualities. Another example is breeding good size fruits or vegetable together to keep on getting the good size.

Selection done by humans looking to maximize traits in animals under domestication. These traits are not always for the benefit of the organism though. Men raise these animals and mate the ones they think will breed true for a man favored trait and cull the rest of the organisms by killing them, or by not allowing them to breed.

a species can gradually change into new species

fossils are preserved animals or plants. but index fossils are fossils have wide distribution,many of them,evolves rapidly, and very easy to recognize.

Ammonites are index fossils.

The fossils were made only in a certain short time period.

Food supply

NADH Dehydrogenase

Ubiquinone

Cytochrome b-c1 complex

Cytochrome c

Cytochrome oxidase complex

Vestigial structures do not harm the organism. Nature selects against only harmful traits.

When there is low gene flow

When there is no selective pressure

When there is a bottleneck

Mass extinction

They both decrease genetic variation .

It greatly reduces the total population, which increases the effects of genetic drift on allele frequency.