The height of a plant is controlled by three genes. The maximum height in the species is 24 inches, whereas the minimum height in the species is 6 inches. What would be the height of a plant of the same species whose genotype is AaBBcc?

Question

The height of a plant is controlled by three genes. The maximum height in the species is 24 inches, whereas the minimum height in the species is 6 inches. What would be the height of a plant of the same species whose genotype is AaBBcc?, 12 inches, 15 inches, 18 inches, 21 inches

MARKS App · Accepted Answer

This is an example of polygenic or quantitative inheritance. Let the height contributed by each dominant allele be 'x' inches and that by each recessive allele be 'y' inches. AABBCC will have maximum height. Thus, 6x = 24 and x = 4. aabbcc will have a minimum height. Therefore, 6y = 6 and y = 1. The given genotype AaBBcc has 3 dominant alleles and 3 recessive alleles. Thus 3 x + 3 y = 3 4 + 3(1) = 15

Search any question & find its solution

Looking for more such questions to practice?