BIO 3122 Lecture Notes - Lecture 13: Genetically Modified Maize, Sepsis, Housefly
23 Jan 2018
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Document Summary
Artificial selection in crop production: 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: teosinte has now evolved into maize, many traits were selected for including fewer flower heads and fruits per plant, maize grows as a single flower head. Size and number of kernels have increased: wild and domesticated wheat, wild wheat seeds when ripe burst off (spreading of seeds wider for less competition, modern wheat holds heir seeds at maturity. 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. Short period of time: certain traits of dogs were favoured early on - less tolerance for aggression, bred for specific tasks like hunting or carrying or pulling (sled dogs).
