BIOLOGY 1M03 Lecture Notes - Lecture 1: Greylag Goose, Sensory Cue, Haplodiploidy
Document Summary
*all lecture slides belong to dr quinn or dr evans, and the mcmaster biology facility. Epigenetic - changes in phenotype based in dna but not changes in sequence. Changes in gene expression but not dna sequence: deprivation experiment: prevent learning opportunities by isolating subject. Spiders know how to spin a web without being taught - on their first try. Squirrel will bury the nuts without being taught. Kangaroo rats sense when snakes are near, and they will leap up and backwards, without ever seeing a snake. Through genetics. (part of deprivation) fixed action pattern (fap) - pattern that appears essentially complete and played out to completion with a sensory cue. Sign stimulus - external stimulus that triggers a fap. Ex, an egg that is out of place. If you take an egg out of its nest and put it a certain distance away, the greylag goose will leave to look for it and use its neck to collect it.