Question

A homozygous plant having round (R) and yellow (Y) seeds is crossed with homozygous plant having wrinkled (r) and green (y) seeds:

1. Give the scientific name of the plant on which Mendel conducted his hybridization experiments.
2. Give the genotype of the F₁ generation.
3. Give the dihybrid phenotypic ratio and the phenotype of the offspring of the F₂ generation when two plants of the F₁ generation are crossed.
4. Name and state the law which explains the dihybrid ratio.
5. Give the possible combinations of gametes that can be obtained from F₁ hybrid.

Answer 1

1. Pisum sativum
2. RrYy
3. 9 : 3 : 3 : 1
4. Law of Independent Assortment, which states that when the parents differ in two or more alleles, then the inheritance of one pair of alleles does not depend on the other pair.
5. RY, Ry, rY, ry