Principle of Inheritance and VariationEasyBloom L2
Question
Which of the following illustrates pleiotropy?
Options
A.In fruit flies, the genes for scarlet eyes and hairy body are located on the same chromosome.
B.Matings between earless sheep and long-eared sheep always result in short-eared offspring.
C.Wheat kernels can range from white to red in color, a trait controlled by several genes.
D.The human cystic fibrosis gene causes many symptoms, from respiratory distress to digestive problems.
Solution
Sol.(d) [Key Concept: Pleiotropy — One Gene Multiple Effects] Pleiotropy is when a SINGLE gene affects MULTIPLE phenotypic traits. The human cystic fibrosis gene (CFTR) is the best example — a single mutation in one gene causes multiple symptoms including respiratory problems (thick mucus blocking airways), digestive problems (blocked pancreatic ducts), infertility, and salty sweat. Option (a) is linkage; (b) is incomplete dominance; (c) is polygenic inheritance.
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