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Definition
| the change in the genetic makeup of a population over time |
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Definition
selective pressure exerted by humans on
populations in order to improve or modify
particular desirable traits |
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Term
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Definition
the process by which characteristics of a
population change over many generations as
organisms with heritable traits survive and
reproduce, passing their traits to offspring |
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Definition
| all the genes, including all the different alleles for each gene, that are present in a population at any one time |
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Definition
Proportion of each allele in the gene pool.
# of copies of the allele/ total # of copies of all alleles. |
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Definition
| Proportion of each genotype among individuals in the population. |
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Definition
| where a population may gain or lose alleles when fertile individuals move into or out of the population or when gametes are transferred between populations. Tends to reduce differences between populations |
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Definition
| a change in the gene pool of a population due to chance |
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Definition
| genetic drift due to drastic reduction in population size |
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Definition
| type of genetic drifting resulting from the establishment of a small, new population whose gene pool differs from that of the parent population |
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Definition
| the change in a gene pool from a situation where there exists at least two variants of a particular gene (allele) to a situation where only one of the alleles remains |
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Definition
| choosing mates with similar phenotypes (and presumably, similar genotypes) to oneself |
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Definition
| choosing mates with sdissimilar phenotypes and presumably, different genotypes to oneself |
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Definition
choosing mates who are genetically related to oneself
Increases probability of lethal genotypes |
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Term
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Definition
| differential reproductive success due to variation among individuals in survival and reproduction |
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Term
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Definition
| describes individual reproductive success and is equal to the average contribution to the gene pool of the next generation that is made by an average individual of the specified genotype or phenotype |
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Term
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Definition
| a population or group of populations whose members have the potential to interbreed in nature and produce viable, fertile offspring, but do not produce viable, fertile offspring with members of other such groups |
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Definition
| the specimen, or each of a set of specimens, on which the description and name of a new species is based. |
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Definition
initial block to gene flow
comes from a geographic barrier that isolates a population |
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Term
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Definition
| A new species arises within the same geographic area as its parent species |
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Definition
| When species cells have more than two complete sets of chromosomes |
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Definition
| Regions where interbreeding between divergent populations occurs and hybrid offspring are frequent |
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Term
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Definition
| The development of many different forms from an originally homogeneous group of organisms as they fill different ecological niches |
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