BIOA02H3 Lecture : Chapter 23 Species and Their Formation Combination of Lecture and Textbook
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Species are the result of processes that unfold over time. Speciation: process by which one species splits into 2 or more daughter species: a species starts at a speciation event and ends either with extinction or another speciation event (produces daughter species, happens gradually. Interbreeding populationgenetically different but reproductively compatible -also reproductively incompatible: the point at which daughter populations can be considered a different species depends how you define distinct species. Species=different kinds: defined in different ways, morphological species concept: members look alike because they share alleles. use binomial system of nomenclature but we need something else because some males and females of the same species look alike and sometimes parents and offspring of same species do/don"t look alike: biology species concept: Species are groups of actively or potentially interbreeding natural populations which are reproductively isolated from other such groups. Individuals in a population can mate with each other but not with those of another population.