Question

In peas, the allele for tall stems (T) is dominant to that for dwarf stems (t), and the allele for axial flowers (A) is dominant to that for terminal flowers (a). A plant of unknown genotype with tall stems and axial flowers is crossed with a plant with dwarf stems and terminal flowers. Among the offspring are 38 plants with tall stems and axial flowers, and 36 plants with tall stems and terminal flowers. What is the previously unknown genotype

Answer 1

The correct answer is TTAa

Explanation:Because we are crossing over two genotypes and the offspring does not have a dwarf stem, there is no recessive trait in the unknown genotype meaning t is out of the question. However, both axial flowers and terminal flowers are produced, meaning the unknown genotype had to be recessive in order to have had conceived both. Thus, we have homozygous TT and heterozygous Aa as our answer.