A pea plant with red flowers is test crossed; half of the resulting progeny have red flowers, while the other half have white flowers. The genotype of the test crossed parent was:

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Quizplus · Accepted Answer

When a pea plant with red flowers (which is most likely homozygous dominant, i.e. RR) is test crossed with a pea plant with white flowers (which is homozygous recessive, i.e. rr), all of the offspring should have red flowers if the tested plant is RR. However, if the tested plant is Rr, then half of the offspring should have red flowers (dominant phenotype) and the other half should have white flowers (recessive phenotype). Therefore, the most likely genotype of the tested plant is Rr.

A Pea Plant with Red Flowers Is Test Crossed; Half