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A pure tall and a pure dwarf plant were ...

A pure tall and a pure dwarf plant were crossed to produced offsprings . Offsprings were self crossed, then find out the ratio between true breeding tall to true breeding dwarf?

A

I:I

B

3:I

C

2:I

D

1:2:I

Text Solution

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The correct Answer is:
A
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Nicotiana sylvestris flowers only during long days and N.tobacum flowers only during short days. If raised in the laboratory under different photoperiods. they can be induced to flower at the same time and can be cross fenjlized to produce self-fertile offspring. What is the best reason for considering N. sylvestfis and N. tobocum to be separate species?

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