BIO 3122 Study Guide - Midterm Guide: Pleiotropy, Internal Fertilization, Wrasse
23 Jan 2018
School
Department
Course
Professor
Document Summary
How do humans impose selection on other organisms. Through artificial selection by humans interested in particular traits; selection on florets (broc, caul), leaves, or sprouts. Scientists use genetic tools to understand steps toward domestication: Many traits were selected for including fewer flower heads and fruits per plant. Wild wheat seeds when ripe burst off (spreading of seeds wider for less competition) So annoying for humans bc hard to collet ripe seed heads for a plant that bursts like that. Oil comes from seeds, larger seed heads to carry more seeds. Gradual increase in cob size documented by archaeologists. Size of cobs in archaeological dig sites became very impt for understanding cultural change. Selection for larger cobs and more kernels per cob. Domestic dog diversity created in last 15 000 years. Certain traits of dogs were favoured early on - less tolerance for aggression. Bred for specific tasks like hunting or carrying or pulling (sled dogs).
