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BILD3
Lecture 5
| Term | Definition |
|---|---|
| Directional Selection | one extreme phenotype is most fit (decreases variation and changes population mean |
| Stabilizing Selection | intermediate phenotypes most fit (decreases variation and no change in population mean) |
| Destabilizing Selection | two extreme phenotypes are more fit than intermediate phenotypes (no change in population mean and increases variation) |
| Frequency-dependent Selection | Fitness of phenotype depends on phenotype frequencies in the population; (a) Negative frequency dependence: fitness decreases with frequency and (b) Positive frequency dependence: fitness increases with frequency |
| Probability | How likely is it that something will happen? The formal study of the laws of chance |
| Gene | the functional unit of heredity |
| Allele | alternative forms of a gene (A1 or A2, A or a, p or q) * there are two inherited alleles for each gene of a diploid organism – one maternal and one paternal |
| Locus/loci | location of a gene on a chromosome |
| Homozygous | refers to having identical alleles for a single trait |
| Heterozygous | they are different from one another |
| Equilibrium | The condition in which all acting influences are balanced or canceled by equal opposing forces, resulting in a stable system |
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stacymdez