Normal growth in oats dominates over gigantism, and early maturity over late maturity.

Normal growth in oats dominates over gigantism, and early maturity over late maturity. The genes of both traits are in different pairs of chromosomes. What percentage of giant early maturing plants can be expected from crossing plants heterozygous for both traits.

Let’s designate the gene that causes normal growth of oats as K, and the gene that causes the development of giant oats as k.

Let’s designate the gene that determines the early maturity of oats as L, and the gene for its late maturity as l.

Oats heterozygous for both traits have the KkLl genotype, which corresponds to their early maturity and normal growth.

Such plants produce sex cells of four types – KL, Kl, kL, kl.

The offspring of these plants are represented by the following possible options:

early maturing oats with normal growth (4 KkLl, KKLL, 2KkLL, 2KKLl) – 56.25%;

early maturing oats with gigantic growth (2Kkll, KKll) – 18.75%;

late-ripening oats with giant growth (kkll) – 6.25%;

late-ripening oats with normal growth (kkLL, 2kkLl) – 18.75%.

Answer: 18.75% of the obtained plants in the offspring will be represented by early-maturing oats with giant growth.