Term
|
Definition
| structures in different species that are similar because of common ancestry |
|
|
Term
|
Definition
| structures in different species that are similar because of convergent evolution rather than descent from a common ancestor with the same trait |
|
|
Term
|
Definition
| features that apparently serve no function in an organism and are allegedly holdovers from an evolutionary past. |
|
|
Term
|
Definition
| natural selection that favors individuals at one end of the phenotypic range |
|
|
Term
| Diversifying/Disruptive selection |
|
Definition
| natural selection that favors individuals on both extremes of a phenotypic range over intermediate phenotypes |
|
|
Term
|
Definition
| Natural selection that favors intermediate variants by acting against extreme phenotypes |
|
|
Term
|
Definition
| the selective breeding of domesticated plants and animals to encourage the occurence of desirable traits |
|
|
Term
|
Definition
| the existence of two or more distinct morphs each represented in a population in high enough frequencies to be readily noticeable |
|
|
Term
|
Definition
| a graded variation in a trait that parallels a gradient in the environment |
|
|
Term
|
Definition
| Mating of genetically unrelated individuals |
|
|
Term
|
Definition
| greater reproductive success of heterozygote individuals compared to homozygotes;tends to preserve variation in gene pools |
|
|
Term
|
Definition
| unpredictable fluctuations in allele frequencies from one generation to the next b/c of a populations finite size |
|
|
Term
|
Definition
| genetic additions to or subtractions from a population resulting from the movement of fertile individuals or gametes |
|
|
Term
|
Definition
| a change in the DNA of a gene, ultimately creating genetic diversity |
|
|
Term
|
Definition
| Genetic drift resulting from the reduction of a population,such that the surviving population is no longer genetically representative of the original population |
|
|
Term
|
Definition
| a localized group of individuals that belong to the same biological species (that are capable of interbreeding and producing fertile offspring) |
|
|
Term
|
Definition
| the existence if biological factors(barriers) that impede members of two species from producing viable, fertile hybrids. |
|
|
Term
|
Definition
| a mode of speciation induced when an ancestral population becomes segregated by a geographical barrier or is itself divided into two geographically isolated subpopulations |
|
|
Term
|
Definition
| A mode of speciation occuring as a result of a radical change in the genome of a subpopulation, reproductively isolating the subpopulation from the parent population |
|
|
Term
|
Definition
| morphological differences like genitals and appearance that prevent successful mating |
|
|
Term
|
Definition
| Species that breed during different times of the day, different seasons, or different years and cannot mix their gametes |
|
|
Term
|
Definition
| the emergence of numerous species from a common ancestor introduced into an environment that presents a diversity of new oppurtunities and challenges |
|
|
