BIOA01H3 Lecture Notes - Lecture 27: Selective Breeding, Gamete, Chromosome

• School: UTSC
• Department: Biological Sciences
• Course: BIOA01H3
• Professor: Monica Sauer

Document Summary

1800s - no one knew about dna or chromosomes. They had been doing practical genetics . i. e. artificial selection for domesticated animals and crops, had been going on for 1000"s of years, but no one understood how visible traits were inherited. Two prevailing theories: the homunculus theory. The sperm-producing parent donates an entire copy of itself to the offspring; the egg only provides nutrients. Problem - many offspring look somewhat like both parents, and some look more like their mom: the blended theory of inheritance. The sperm and egg contain essential essences that mix together in offspring. Selfing: occurs naturally where the pollen, the male gametes of the flower, gets brushed off and get unto to the egg, stigma, bearing a part of the plant within the same plant. Within the same flower, the pollen brushes to get unto the egg (sigma) of the same plant.