question_answer 55)

  In peas ,tallness is dominant over dwarfness, and red colour of flowers is dominant over the white colour. 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.

Answer:

                  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 Parents Tall and red (TtRr) x Dwarf and white (ttrr)Offsprings  

♂ ♀	TR	Tr	tR	tr
tr	Ttrr (tall and red)	Ttrr (tall and white)	ttRr (dwart and red)	ttrr (dwarf and white)