Ch 15. Vocab

Front 1

Evolution

Back 1

Change in a kind of organism overtime; process by which modern organisms descended from ancient organisms

Front 2

Fossil

Back 2

preserved remains or evidence of an ancient organism.

Front 3

Natrual Selection

Back 3

process by which individuals that are better suited to their environment survive and reproduce successfully; also called survival of the fittest.

Front 4

Artifical Selection

Back 4

selection by humans for breeding of useful traits from the natrual variation among different organisms

Front 5

Homologous structure

Back 5

Structures that have different mature forms in different organism but develop from the same embryotic tissues

Front 6

Vestigal Organs

Back 6

organ that serves no useful function in an organism

Front 7

Gene Pool

Back 7

combined genetic info. of all the members of a particular population

Front 8

Relative Frequency

Back 8

number of times an allele occurs in a gene pool compared with the number of times other allele occur

Front 9

Genetic Drift

Back 9

random change in allele frequencies that occurs in small populations

Front 10

Directional Selection

Back 10

form of natrual selection . occurs when individulas at one end of a distribution curve have a higher fitness than individuals in the middle or at the other end.

Front 11

Disruptive selection

Back 11

form of natrual selection in whicha single curve splits into twos; occurs when individuals at the upper and lower ends of a distribution curve have higher fitness than individuals near the middle

Front 12

Stabalizing selection

Back 12

form of natrual selection by which the center of the curve remains in its current position, occurs when individuals near the center of a distribution cure have higher fitness than individuals at either end.