CBSE Class 10 Answered

Genotype is the genetic constitution of an individual organism. Phenotype is the set of observable characteristics of an individual resulting from the interaction of its genotype with the environment.

In a dihybrid cross, t?he phenotypic ratio is 9:3:3:1 whereas the genotypic ratio is 1:2:1:2:4:2:1:2:1.?

For example - In a? cross between RRYY (round yellow seeds of pea plant) and rryy (green wrinkled seeds of p?ea plant), all F1 offspring would be RrYy i.e. Round yellow.

In F2 generation, w?e will get the following combination of gametes - RY Ry rY ry RY. When crossed, they would? give the following possible offspring:

1 YYRR + 2 YYRr + ?1 YYrr + 2YyRR + 4YyRr + 2 yyRR + 1yyRR + 2yyRr + 1yyrr

Thus the genotype ?ratio is 1:2:1:2:4:2:1:2:1

 ?

T?he phenotype ratio is 9:3:3:1.  i.e. 9 round-yellow : 3 wrinkled-yellow : 3 round-green : 1 w????rinkled-green pea seeds