Question

In peas, tallness is dominant over dwarfness, and redcolour of flowers is dominant over the white colour.When a tall plant bearing red flowers was pollinated by a dwarf plant bearing white flowers, the different phenotypic groups were obtained in the progeny in numbers mentioned against them.

Tall, Red = 138

Tall, White = 132

Dwarf,Red = 136

Dwarf, White = 128

Mention the genotypes of the two parents and of the types of four offspring.

Answer 1

The result shows that the four types of offspring are in a ratio of 1:1:1:1. Such a result is observed in a test-cross progeny of a dihybrid cross.

The cross can be represented as

Tall & Red (Tt Rr) × Dwarf & white (ttrr)