BICD 100 Study Guide - Midterm Guide: Gregor Mendel, Pangenesis, Genotype
5 Nov 2016
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Mendel: pea plants: took male part of one plant and painted onto female part of other plant for reproduction, noticed 7 different traits that varied in a binary fashion. Flower color, position, seed color, seed shape, pod shape, pod color, stem length: took parental generation (true-breeding parents) and bread them, purple vs. white flowers. F1 generation: all plants had purple flowers. F1 x f1 to f2 generation: 3 to 1 ratio of purple to white flowers. Me(cid:374)del"s postulates: 1) genotype: alleles an individual carries for a specific gene. For each characteristic, an organism inherits 2 alleles, one from each parent; the alleles can be the same or different. Heterozygous genotype: different alleles: 2) if alleles differ, dominant allele determines orga(cid:374)is(cid:373)"s appeara(cid:374)(cid:272)e; recessive allele has no noticeable effect. Phenotype: appearance or expression of a trait. Same phenotype may be determined by more than one genotype.
