Q. 7. In peas, tallness is dominant over dwarfness, and red color of flowers is dominant over the white color. When a tall plant bearing red flowers was pollinated with 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 four offspring types.
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 dihybrid cross.
The cross can be represented as
Parents Tall and red (TtRr) Dwarf and white (ttrr)
Offsprings
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