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Subject - genetics

Selection (lat. selectio "to choose") refers to the change in occurrence of alleles in the gene pool of a population as a function of biotic and abiotic environmental factors.

Selection is a directed process, but it is opportunistic rather than planned. It allows for adjustment to environmental conditions and leads to evolution in the long term.

Increased reproductive success and associated passing on of genes to the next generation are attained by those individuals who make better use of available food supplies, have a more successful mating display, practice more efficient brood care, and have higher resistance to parasites and disease, among other traits.

Recommended Learning Units

Cell Cycle, Mitosis, and MeiosisLevel 260 min.

BiochemistryBiological FundamentalsCell Cycle

Cell reproduction is based on the principle of cell division. In order to divide a cell into two identical daughter cells, all of the genetic material and all cell components must be duplicated. Animated illustrations demonstrate the cell cycle responsible for this, as well as illustrating cell division by mitosis and meiosis.