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NEET2005ZoologyPrinciples of Inheritance and VariationActual

Grain colour in wheat is determined by three pairs of polygenes. Following the cross AABBCC (dark colour) x aabbcc (light colour), in F ₂ generation what proportion of the progeny is likely to resemble either parent?

Options

  1. ANone
  2. BLess than 5 percent
  3. COne third
  4. DHalf

Correct answer

B. Less than 5 percent

Step-by-step solution

Polygene results in quantitative inheritance. Quantitative inheritance is characterised by occurrence of intermediate forms between the parental type. There will be 7(1: 6: 15: 20: 15: 6: 1) phenotypes when three polygene pairs are involved. The total number of progeny would be 64 . Out of these sixty four only two will be likely to resemble either parents. Hence their proportion in F ₂ generation would be 3.12 i.e. less than five per cent.

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