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15 Cards in this Set

  • Front
  • Back
Artificial selection
nature provides variation and humans select those variations they find useful
struggle for existence
members of each species competge regularly to obtain food, living space, and other necessities of life
ability of an individual to survive and reproduce in its specific environment
any inherited characteristic that increases an organism's chance of survival
survival of the fittest
individuals that are better suited to their environment survive and reproduce more successfully
natural selection
takes place without human control or direction
descent with modification
living species has descended with changes from other species over time
common descent
all species were derived from common ancestors
homologous structres
structures that have different mature forms but develop from the same clumps of cells in embryos
vestigial organs
organs of many animals are reduced in size that they are ust traces of homologous organs in other species
gene pool
consists of all genes that are present in a population
relative frequency
the number of times that the allele occurs in a gene pool compared with the number of times other alleles for the same gene occur
single-gene trait
controled by a single gene that has two alleles
polygenic traits
traits that are controlled by two or more genes
sources of genetic variation
muations and gene shuffling