BIO 1130 Lecture Notes - Lecture 5: Disruptive Selection, Anagenesis, Sperm Competition

• School: University of Ottawa
• Department: Biology
• Course: BIO 1130
• Professor: Jon Houseman

Document Summary

A prezygotic reproductive isolating mechanism that results from geographical separation between two populations. Populations evolve independently and diverge into different species. Signal word in cladistics demonstrating derived characters within a group. Over time, a trait will change into something else, emerge, or disappear. Drago(cid:374) fl(cid:455)"s foldi(cid:374)g wi(cid:374)g (cid:373)e(cid:272)ha(cid:374)is(cid:373) is apo(cid:373)orphi(cid:272) i(cid:374) relatio(cid:374) to the beetle. Also known as ethological isolation, it is prezygotic isolation process in which two species do not mate due to differences in courtship behaviour. For example, different bullfrog species use different mating songs. Different fireflies use different light burst sequences to differentiate. Biological species between males and females as well as species. The concept of species based on the ability of populations to breed and produce fertile offspring defined by ernst mayer in 1942. Issues are that we need to prove reproductive isolation, which is fine with presently living species, but tough to do through the fossil record.