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NEETZoologyPrinciples of Inheritance and Variation

What does the ratio of 9:3:3:1 represent in Mendel's dihybrid cross?

Options

  1. AA combination series of 3 yellow: 1 green with 3 round: 1 wrinkled
  2. BA combination series of 2 yellow: 2 green with 2 round: 2 wrinkled
  3. CA combination series of 1 yellow: 3 green with 1 round: 3 wrinkled
  4. DA combination series of 4 yellow: 4 green with 4 round: 4 wrinkled

Correct answer

A. A combination series of 3 yellow: 1 green with 3 round: 1 wrinkled

Step-by-step solution

In the dihybrid cross (Figure 4.7), the phenotypes round, yellow; wrinkled, yellow; round, green and wrinkled, green appeared in the ratio 9:3:3:1. Such a ratio was observed for several pairs of characters that Mendel studied. The ratio of 9:3:3:1 can be derived as a combination series of 3 yellow: 1 green, with 3 round : 1 wrinkled. This derivation can be written as follows: (3 Round : 1 Wrinkled) (3 Yellow : 1 Green) = 9 Round, Yellow : 3 Wrinkled, Yellow: 3 Round, Green : 1 Wrinkled, Green Based upon such observ

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