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Definition
| layers of rock or sedimentary material |
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| changes in history occur at a uniform rate |
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| formation of a new species |
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Definition
| breeders (humans) select animals with particular traits to reproduce |
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| anatomical features that are fully developed in one grouop of organisms but reduced and nonfunctional in other similar groups. |
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| Anatomical similar structures explainable by inheritance from a common ancestor |
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Definition
| serve the function, but are not constructed similiarly |
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Definition
| Alternate states of a gene |
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Definition
| having two sets of chromosomes |
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Definition
| a sequence of DNA that dictates a trait |
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Definition
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Definition
| two different alleles in a pair of homologous chromosomes |
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Definition
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| the physical expression of an allele |
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Definition
| masked by the presence of a dominant allele |
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Definition
| These are the raw material for evolutionary change |
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Term
Gene Flow
also Gene Migration |
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Definition
| the movement of alleles between populations by migration of breeding individuals |
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Definition
| occurs when individuals tend to mate with those that have the same phenotype with respect to a certain characteristic |
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Definition
favors characteristics that increase the liklihood of obtaining mates.
Males have to compete for mates, best looking of most fit are most likely to mate. |
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Definition
| Refers to changes in the allele frequencies of a gene pool due to chance. |
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| Occurs when a catastroffic reductin in a population occurs, such as a major epidemic or a hurricane, and only a select few are left to reproduce. |
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Definition
Segregation
o Each gamete carries only one allele for a particular trait o Gametes combine randomly to form offspring |
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Definition
Independent Assortment
o Genes located on different chromosomes are inherited independently (a few loci are close enough to be linked.) |
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Term
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Definition
| Can be influenced by two or more genes (continuous variation) |
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Definition
| Have more than one effect (results in man "phenotypes") |
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Definition
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Term
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Definition
| More than two alleles on each gene |
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| Sex-linked (x-linked) Inhereritance |
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Definition
| Traits inhereited by genes not found on Y chromosome. |
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Term
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Definition
| Alleles are separated during meiosis. |
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Term
| Law of Independent Assortment |
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Definition
| Segregation of all alleles occurs at random |
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Term
| What's with oceanic islands and Darwin? |
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Definition
Island species are more similiar to nearby islands than the distanct ones.
Despite Maritime ecology, islands species are more similiar in composistion to the nearest mainland than they are to distant lands. |
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Term
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Definition
| The evolution of species into a diversity of previously unoccupied ecological niches |
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