Scematic representation of dehybrid cross
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Meghna Thapar 3 years, 6 months ago
A dihybrid cross is a cross between F1 offspring of two individuals that differ in two traits of a particular interest. For example, Mendel took homozygous dominant Round and yellow seeds (RRYY) and crossed it with homozygous recessive wrinkled and green seeds (rryy), the progeny obtained in F1 generation were all round and yellow seed (RrYy). The offsprings were heterozygous for both R and Y gene. The F1 plant has four types of gametes, RY, Ry, rY, and ry. For genes on separate chromosomes, each allele pair shows independent assortment. Thus, by crossing F1, the phenotypic ratio was 9:3:3:1, where 9 is yellow and round seeds, 3 represents round and green seeds, 3 represents yellow and wrinkled seeds and 1 represents green and wrinkled seeds.
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