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Principles Of Inheritance And Variation

Question
CBSEENBI12002788
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Which one of the following is an example of polygenic inheritance?

  • Flower colour in Mirabilis jalapa

  • Production of male honey bee

  • Pod shape in garden pea

  • Skin colour in humans

Solution

D.

Skin colour in humans

Polygenic inheritance involves the determination of a particular phenotypic characterisitc by many genes, called polygenes (i.e., the group of genes influencing a quantitative characteristic), each having a small effect individually.
The characteristics controlled in this way show continuous variation and are called polygenic characters e.g., height and skin colour in humans.
The polygenic inheritance is called multifactorial inheritance or quantitative inheritance.
The pink flower colour in Mirabilis jalapa is an example of incomplete dominance while production of male honey bee is an example of parthenogenesis.

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