BISC 1112 Lecture 3: Lecture 3
15 Feb 2017
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Document Summary
Evolutionary processes create the diversity of life and species. Consist of change in allele frequencies in a population over time. Species in a group of pop whose members have the potential to interbreed in nature, need to: Existence of biological factors that impede viability. Can be classified by factors before or after fertilization to form a zygote. Physically unable to mate together parts don"t fit- morphological differences. Sperm of one species may not be able to fertilize egg of other. Species encounter each other rarely or never. Genes of diff parent, turn out frail or feeble. Make it to adult seem successful, but are then unable to breed with one another. Hybrid breakdown- in next gene hybrids can breed but offspring will have problems. Offspring of the crosses will fail over a couple generations. Views a species in terms of eco niche. Defines a species as smallest group of individuals in phylogenetic tree.
