BIOL 101 1nd Edition Lecture 22 Outline of Last Lecture I Population Genetics II Hardy Weinberg Principle Outline of Current Lecture I Biological Species Concept II Reproductive Barriers a Pre zygotic Barriers b Post zygotic Barriers Current Lecture The Origin of Species Class Discussion I Concepts of Species A Ernst Mayr s Biological Species Concept a group of populations whose Individuals have the potential to mate and produce viable fertile offspring B Alternative definitions are needed Why Ecological morphological we cant always tell if species interbreed and produce fertile offspring For organisms that are extinct and for organisms that reproduce asexually C Reproductive Barriers why can t related species mate 1 Five pre zygotic Barriers and examples a Mechanical isolation differences in physical structures prevent successful mating b Habitat Isolation live in same area but different habitats so don t encounter each other c Temporal isolation species breed at different times of the day or different seasons d Behavioral isolation different courtship rituals or other behaviors prevent mate recognition between species These notes represent a detailed interpretation of the professor s lecture GradeBuddy is best used as a supplement to your own notes not as a substitute e Gametic isolation male and female gametes of different species fail to unite fertilization did not occur 2 Three post zygotic Barriers and examples a Reduced Hybrid Viability the development or survival of hybrids is impaired b Reduced Hybrid Fertility hybrids fail to produce functional gametes c Hybrid Breakdown offspring of hybrids are feeble or infertile
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