Biology 1001A Study Guide - Midterm Guide: Gradualism, Kinetochore, S Phase

• School: Western University
• Department: Biology
• Course: Biology 1001A
• Professor: Tom Haffie

Document Summary

Mutations are random they are not directed towards the needs of species. The selective pressure causes the selective advantage of a trait. Biologi(cid:272)al gradualis(cid:373): dar(cid:449)i(cid:374)"s (cid:448)ie(cid:449)-the speed at which a population evolves. Evolution is short-sighted, selection does not predict the future of present survival of the fittest. Reverse transcription of hiv makes it easier to target the virus. Almost all species have the same dna sequence which shows that we all come from the same ancestor. Fossil records show that how some species changed in size and how they separated into different groups which shows how species evolved over time. Whe(cid:374) so(cid:373)eo(cid:374)e goes o(cid:374) a drug holiday (cid:449)e re(cid:373)o(cid:448)e the sele(cid:272)tio(cid:374) (cid:449)hi(cid:272)h (cid:373)ea(cid:374)s that there"s no natural pressure anymore and the virus population increases faster. Differential production: some phenotypes have some advantage compared to other phenotypes for example the azt resistance trait.