BIO 202 Chapter Notes - Chapter 14: Dihybrid Cross, Zygosity, Genotype
15 Jan 2019
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True breeding: plants of certain types self- pollinate for many generations so all offspring resemble the parents. Monohybrid cross: mating between individuals who have different alleles at one genetic locus of interest. For example, a monohybrid cross would be between a parent with a gg genotype and a gg phenotype: f1 generation is a the offspring produced by a monohybrid cross. All offspring are heterozygous, expressing the dominant phenotype: f2 generation are the offspring produced from the self pollination of the f1 generation. The ratio of offspring produced have 1 to 3 recessive to dominant: a dihybrid cross is a cross between two different genes that differ in two different observed traits. The phenotypic ratio produced would be 9 to 3 to 3 to 1. The phenotype of two dominant traits would be nine and the phenotype of two recessive traits would be. For an f1 generation of a dihybrid cross, the phenotype expressed would be 3:1.
