In peas,tall plants are dominant to short plants.A cross between a tall pea plant and a short pea plant results in half the progeny being tall,and the other half being short.Therefore,the tall parent plant is genotypically

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If the tall parent plant was homozygous, then all of the progeny would be tall since each offspring would receive a dominant tall allele from both parents. Therefore, the tall parent must be heterozygous, having one dominant tall allele and one recessive short allele, resulting in half of the progeny being tall (receiving the dominant allele) and half being short (receiving the recessive allele).

In Peas,tall Plants Are Dominant to Short Plants