| A | B |
|---|
| change in species over time | evolution |
| theory to explain changes in species | natural selection |
| developed theory of natural selection | Darwin |
| God created all life in unchanging form | creationism |
| members of a species are different | variation |
| competition for food, water, space | struggle for existance |
| different form of a gene | allele |
| having two of the same allele | homozygous |
| having two different alleles | heterozygous |
| change in species caused by change in -- | environment |
| process of becoming suited to an environment | adaptation |
| two opposing forces for evolution | balancing selection |
| 'Chicks dig it" causes: | sexual selection |
| only one force acting to change species | directional selection |
| accumulation of difference between groups of a species | divergence |
| groups within species that become different | ecological races |
| group of organisms that can breed fertile offspring | species |
| type of evolution-slow, constant change | gradualism |
| evolution occurs at irregular rate | punctuated equilibrium |
| Darwin's book | Origin of Species |
| Darwin's ship | Beagle |
| bilologist who had similar ideas to Darwin | Wallace |
| islands that are home to Darwin's Finches | Galapagos |
| mechanism for evolution | natural selection |
| sickle cell anemia is an example of -- - selection | balancing |
| increasing length of giraffe neck is -- selection | directional |
| ecological races may become new: | species |
