BIOL 1001 Chapter : Chapter 10 InheritancePart 2 Of 2
Document Summary
Testcross is the breeding of an organism of _unknown genotype with a __homozygous recessive organism _____ Testcross for seed texture genotype: unknown could be homozygous smooth or heterozygous smooth. According to the law of __independent assortment___, __genes for different traits are inherited independently __of each other. The parental crosses that mendel did in his earlier experiments involved parental varieties that differed in a single trait (i. e. , __monohybrid__crosses) In later experiments, mendel crossed __parental varieties that differed at two traits: dihybrid cross. By using plants that were __true breeding (homozygous)____ for two different traits, mendel tested if. He hypothesized that the __two trait types would either be inherited together__ (null hypothesis), or they would be independently inherited (alternative hypothesis). If genes sort out together then the f2 will show a 3:1 phenotype. Combinations from sy and sy gametes if genes segregated together : But, if they sort out independently then the f2 will have a 9:3:3:1 phenotypic ratio.
