Question

Make a punnett square for finding out the proportion of different genotypes in the progeny of a genetic cross between.

(a) A pure tall (TT) pea plant with a pure dwarf (tt) pea plant.

(b) red flower variety of pea (RR) with white flower variety of pea (rr)

Answer 1

F2 generation-

| Gametes | T | t |
| T | TT | Tt |
| t | Tt | Tt |

Genotype - 1(Homozygous tall) :2 (Heterozygous tall):1 (Homozygous dwarf)

Phenotype - 3 (Tall) :1(Dwarf)

(b)

F2 generation?

| Gametes | R | r |
| R | RR | Rr |
| r | Rr | rr |

Genotype - 1(Homozygous red) :2 (Heterozygous red):1 (Homozygous white)

Phenotype - 3 (Red) :1(White)