Q5 of 53 Page 33

A plant with red flowers was crossed with another plant with yellow flowers. If F1 showed all flowers orange in colour, explain the inheritance.

The inheritance is of incomplete dominance. F1 had a phenotype that did not resembled either of the parent plant and was in between the two.


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What are the characteristic features of a true-breeding line?

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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.