BIOA01H3 Lecture Notes - Gradualism, Hooded Crow, Reproductive Isolation

• School: UTSC
• Department: Biological Sciences
• Course: BIOA01H3
• Professor: Mark Fitzpatrick

Document Summary

Species: group of individuals who are able to mate amongst themselves to make healthy offsprings. Exceptions: horses and donkeys mate to make mules. Hooded crow and carrion crows can make hybrids, but are geographically separated. Reproductive isolation mechanisms: factors that does not allow for successful reproduction. Pre zygotic barriers: prior to when a zygote is formed. Prevention of mating: doesn"t allow for having sex. Behavioral isolation: each species may use different signals or behaviors to attract mates. Temporal isolation: mating at the wrong time cannot allow them to mate even though they could be in the same habitat. Ecological/habitat isolation: species occupy different habitats within the same area wherethey"re separated and cannot mate. Northwest garter snakes prefer meadows while common garter snakes are in water all the time. Mechanical isolation: different species don"t mate because their genitals aren"t compatible for mating. Genitals of damsel flies are different from other flies and can only mate with their own species.