Short height in pea plant is cause by a homozygous recessive condition.?

Question

prove with a punne square that two short plants could never produce a tall plant

Answer 1

The tall gene is dominant in pea plants. This gene will be represented by capital "T". The recessive, or short gene, will be represented by lowercase "t". A short pea plant can only be represented by two lowercase "t"s or tt. A Tt or TT pea plant would be tall. This is shown by the Punnet square:

  _t__t__

t|  tt  | tt   |

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t|  tt  |  tt  |

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Therefore two short plants can only produce short offspring