dihybrid cross is a cross between two organisms involving two distinct If monohybrid cross produces 4 genotype with 3 : I ratio, dihybrid produces 16 genotype with I : 3 : 3 : I ratio.
in dihybrid cross, Mendel crossed round yellow seed pure-breeding pea plants with wrinkled green seed pea plants. In this case, round seed is dominant to wrinkled seed and yellow seed is dominant to green seed. All the offspring of F, generation have round yellow seed. When F1 generation undergo self-pollination, they produce four types of Phenotype with ratio 315 round yellow seed: 108 round green seed : 101 Wrinkled yellow seed: 32 wrinkled green seed. The ratio of F2 generations Can be simplified into 9 round yellow seed : 3 round green seed : 3 wrinkled Yellow seed: 1 wrinkled green seed.
|Dihybrid cross of seed|
Gregor Mendel (1882-1884) Genetics Pioner The basic low of genetic was first stated by gregor mendel, an Autrian, monk, in 1866. A Danish botanist, Johansen called the heredity factor in mendel’s experiment as gene (1909). In 1912, Thomas Morgan, an American scientist, explained that genes lay in chromosome. In this case, Morgan used fruit fly, Drosophila melanogaster as his study object.
According to the result of the second experiment in dihybrid cross' Mendel composed Mendel's Law II that is known as Lau of independent Assortment. Assortment law states that during gamete formation, each allele assorts independently. The definition of independent assortment is that every male gamete produced by F1, will have the same opportunity to fertilize female gamete produced by F1.