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Question:

Which one of the following best describes polygenic inheritance?

ABO blood group in human and flower colour of Mirabilis jalapa

Human height and colour of skin and eyes

Hair pigment of mouse and tongue rolling in human

Human eye colour and sickel-cell anaemia

Solution:

In polygenic inheritance, several sets of alleles may produce a cumulative effect on the same character, i.e., human height and color of skin and eye. ABO group in human is an example of codominance, whereas flower color of the 4 O' clock plant is an example of incomplete dominance. Hair pigment in mice is an example of recessive epistasis. Sickle-cell anemia is an example of codominance.