CAS BI 107 Study Guide - Quiz Guide: Stamen, Zygosity, Gamete
23 May 2017
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Gregor me(cid:374)del (cid:272)o(cid:374)sidered father of ge(cid:374)eti(cid:272)s (cid:1005)8(cid:1004)(cid:1004)"s (cid:373)o(cid:374)k. Experiments on pea plants- self- pollinating flowers could easily be cross fertilized= hybrid. Hybrid: new types of plants formed by cross fertilizing varieties of the same species. He first grew many varieties of pea plants- made sure each was purebred (when it pollinates itself the successive generation always looks like the parent plant) Mendel began to cross purebred plants that differed in only one characteristic= Monohybrid cross and always chose contrasting traits (height of plant) To cross two plants, pollen was spread from the stamen of a tall plant to the stigma of a short plant. Scientists at the time thought that offspring were a blend of their parents- mendel disproves this. All the offspring of a cross look the same- show characteristics of only one parent. Let the offspring self- fertilize= one or other trait showed in a 3:1 ratio. Genes that control characteristics occur in pairs.
