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15 terms

Adaptations & Evolution

Terms from Ecology Ch. 2
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fitness
contribution an individual makes to future generations
directional selection
the mean value of a trait is shifted toward one extreme over another
stabilizing selection
favor individuals near the middle of the population mean
disruptive selection
favors both extremes of the population mean
dominant
gene that is represented by a capital letter & is expressed if present
recessive
gene that is represented by a lower case letter & masked over by the dominant gene
DNA
nucleic acid that contains the genetic code for all traits in an organism
gene
section of DNA that codes for traits
homozygous
gene that contains alelles that are the same
heterozygous
gene that contains alelles that are different
genotype
the gene combination of an organism
phenotype
the physical appearance of an organism
mutation
a change in the sequence of DNA
sexual reproduction
reproduction that involve two parents
asexual reproduction
reproduction that involves only one parent