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match the terms!

1genetic variation _____ those with too few or too many chromosomes
2epistasis _____Single gene influences many traits (can have multiple phenotypic effects)
3polygenic inheritance  _____ultimate source of genetic variation
4pleiotropy _____failure of homologous chromosomes to separate
5non-disjuction _____opinions regarding the struggle to survive helped to inspire Charles Darwin in his development of the Theory of Natural Selection
6Lamarck _____extreme phenotype is favored over other phenotypes
7Malthus  _____one gene affects the action of another gene
8gene flow _____process in which an individual organism adjusts to a gradual change in its environment (such as a change in temperature, humidity, photoperiod, or pH)
9genetic drift _____refer to differences between individuals or to differences between populations
10heterozygote advantage  _____Characters in a population vary in gradations along a continuum; referred to as quantitative characters
11co-evolution _____trisomy
12directional selection _____the transfer of alleles or genes from one population to another
13stabilizing selection _____heterozygote genotype has a higher relative fitness than either the homozygote dominant or homozygote recessive genotype
14disruptive selection _____mechanism to explain evolution: inheritance of acquired characters
15acclimation  _____he change of a biological object triggered by the change of a related object
16mutation _____example of epistasis
17aneuploid zygotes _____variation in the relative frequency of different genotypes
18Down Syndrome _____select against extreme values
19Fur Coloration _____extreme values for a trait are favored over intermediate values

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