Gregor Johann Mendel, the father of genetics, crossed a round-yellow pea (RRYY) with another green-green pea (rryy) to obtain the round-yellow pea (RrYy) in the F1 lineage. A self-crossing of round-yellow beans (RrYy) in the F1 progeny resulted in 9 round-yellow, 3 round-green, 3 shriveled-yellow and 1 shriveled-green beans in the F2 line.
here,
The gene responsible for the spherical trait is R
Genotype RR for spherical trait
And the gene Y responsible for the yellow color
Yellow color genotype YY
Consequently, the round-yellow genotype is RRYY
again,
The gene responsible for the stunted trait is r
Genotype rr for stunted traits
and the gene responsible for green color y
Genotype in green is yy
As a result, the pale-green genotype is rryy
The first progeny is F1 and the second progeny is F2
Parents : ♂ × ♀
Phenotype: Spherical-yellow shriveled-green
Genotype : RRYY rryy
Gamete : (RY) (ry)
F1 Generation : RrYy (round-yellow)
Self fertilization : F1×F1
Parents : ♂ × ♀
Phenotype : Round-yellow Round-yellow
Genotype : RrYy RrYy
Gamete : (RY) (Ry) (rY) (ry) (RY) (Ry) (rY) (ry)
F2 Generation (checker board)
Remarks: From the checker board, out of 16 beans, 9 are round-yellow, 3 round-green, 3 shriveled-yellow and 1 shriveled-green.
Phenotypic ratio : round-yellow : round-green : shriveled-yellow : shriveled-green = 9 : 3 : 3 : 1