 | Term | Definition |
| |
module |
units of body construction |
| |
heterochromy |
comparing different species, an alternation in the timing of developmental events, leading to different results in adults |
| |
developmental plasticity |
the capacity of an organism to alter it's pattern of development in response to environmental conditions. |
| |
parallel phenotypic evolution |
repeated evolutionary patterns of change that occur independently in multiple lineages |
| |
differential survival |
those individuals in a population that are the most fit can survive. |
| |
population |
any group of organisms coexisting at the same time and in the same place and capable of interbreeding with one another |
| |
adaptation |
a paticular structure , physiological process or behavior that makes an organism better able to survive and reproduce |
| |
gene pool |
all the different alleles of all the genes existing in all individuals of a population |
| |
population bottlenect |
a stressful period during which only a few individuals of a population survive |
| |
gene flow |
exchange of genes btwn diff species (extreme refers to hybridization) or btwn different populations of the same species caused by migration followoed by breeding. |
| |
founder effect |
random changes in allele frequencies resulting from establishment of a population by a very small number of individuals |
| |
artificial selection |
selection by plant and animal breeders of individuals with certain desireable traits |
| |
natural selection |
differential contribution of offspring to the next generation by various genertic types belonging to the same population |
| |
stabilizing selection |
selection against the extreme phenotypes in a population so that the intermediate types are favored |
| |
directional selection |
selection in which phenotypes at one extreme of the population distribution are favored |
| |
disruptive selection |
selection in which phenotypes at both extremes of the population distribution are favored |
| |
sexual selection |
selection by one sex of chracteristics in individuals of the opposite sex. also the favoring of characteristis in one sex as a result of competition among individuals of that sex for mates. |
