How to do trihybrid cross
Trihybrid crosses basically represents the combination of three monohybrid crosses.Mendel performed trihybrid cross by considering three pair of contrasting characters. He crossed pea plnt with tall stem, yellow seed colour and round seed (TTYYRR) with plants having dwarf stems, green colour and wrinkled (ttyyrr).F1 generation was having the genotype of Tt Yy Rr with phenotype of tall stem, yellow and round seeds. In F2 generation,
trihybrid ratio is given below as
Tall yellow round : 27
Tall yellow wrinkled: 9
Tall green round : 9
Dwarf yellow round : 9
Tall green wrinkled : 3
Dwarf yellow wrinkle: 3
Dwarf green round : 3
Dwarf green wrinkled : 1
Thus phenotypic ratio was 27:9:9:9:3:3:3:1
Here we take the common and easy example of AA BB and CC
trihybrid ratio is given below as
Tall yellow round : 27
Tall yellow wrinkled: 9
Tall green round : 9
Dwarf yellow round : 9
Tall green wrinkled : 3
Dwarf yellow wrinkle: 3
Dwarf green round : 3
Dwarf green wrinkled : 1
Thus phenotypic ratio was 27:9:9:9:3:3:3:1
Here we take the common and easy example of AA BB and CC