Q. What should be the genotype of a round seeded tall plant, which when crossed with a plant of similar genotype produces the following percentage of phenotypes? (tall round = 56.26% tall wrinkled = 18.75%, dwarf round = 18.75% dwarf wrinkled =6.25%)

 1866  194 VMMC MedicalVMMC Medical 2013 Report Error

Solution:

The ratio given is - 9:3:3:1 (56-25:18.75:18.75:6.25). This ratio occurs due to the F, hybrid, which is heterozygous for both the genes, i.e., TtRr.