A pure tall and a pure dwarf plant were crossed to produce offspring. Offspring were self-crossed. Find out the ratio between true breeding tall to true breeding dwarf.

1:1

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3:1

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1:2:1

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2:1

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Solution

The correct option is A
1:1

A cross between pure tall (TT) and a pure dwarf plant (tt) produces heterozygous tall (Tt) offspring. When the offspring are self-crossed, we obtain four offspring - 2 heterozygous tall (Tt), 1 pure tall (TT) and 1 pure dwarf (tt). So, the ratio between true breeding tall to true breeding dwarf is 1:1.

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