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NEETZoologyPrinciples of Inheritance and Variation

In the F2 generation, what proportion of plants had yellow seeds?

Options

  1. A1/4
  2. B3/4
  3. C1/2
  4. DAll

Correct answer

B. 3/4

Step-by-step solution

The genotype of the parents can then be written as RRYY and rryy. The cross between the two plants can be written down as in Figure 4.7 showing the genotypes of the parent plants. The gametes RY and ry unite on fertilisation to produce the F1 hybrid RrYy. When Mendel self hybridised the F1 plants he found that 3/4th of F2 plants had yellow seeds and 1/4th had green. The yellow and green colour segregated in a 3:1 ratio. Round and wrinkled seed shape also segregated in a 3:1 ratio; just like in a monohybrid cross.

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