Discussion
When single gene effects multiple characters, the condition is called
Answer: B
The condition is called Pleiotropy.
Pleiotropy is the effect of a single gene on two or more seemingly unrelated characters. A classic example is the gene for sickle-cell haemoglobin, which alters red blood cell shape, causes anaemia and gives resistance to malaria; in plants, a single gene in pea controls both flower colour and seed coat colour.
Epistasis is the opposite kind of interaction, where one gene masks the effect of another gene. Polygeny is the control of one character by many genes, as in height or yield. Codominance is the full expression of both alleles of one gene in a heterozygote.
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