BIO152H5 Chapter Notes - Chapter 14: Gynoecium, Somatic Cell, Gamete
Document Summary
Chapter 14: mendel & the genetic idea. Tuesday, december 9, 2014. Mendel chose to work with peas because they are available in many varieties. Character: heritable feature that varies among individuals. Each variant of the character is called a trait. Reproductive organs of pea plants: stamen (pollen producing) & carpel (egg bearing). Crossing of two breeding is called hybridization. >> true breeding parent: p generation. >>hybrid offspring are f1 generation. >> allowing f1 generation to self pollenate produces f2 population. Mendel used very large sample sizes and kept accurate record of his results. Dominant traits and recessive traits. He developed a model to explain the 3:1 inheritance pattern. >> 1st: alternative versions of genes account for variations in inherited characters- - > called alleles. >>2nd: for each character, an organism inherits two copes of a gene, one from each parent. Testcross: breeding an organism of unknown genotype with a recessive.
