Multiple choice

_________ ratio of Bateson and Punnett in Lathyrus odoratus does not confirm to the law of independent assortment.

  1. 7 : 1 : 1 : 7

  2. 12 : 3 : 1

  3. 1 : 1 : 1 : 1

  4. 9 : 3 : 4
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A Correct answer
Explanation

The 7:1:1:7 ratio is a classic example of gene linkage discovered by Bateson and Punnett in sweet pea (Lathyrus odoratus). This dihybrid ratio deviates from Mendel's expected 9:3:3:1 ratio because the two genes are linked on the same chromosome and do not assort independently. Options 12:3:1, 1:1:1:1, and 9:3:4 represent other genetic interactions (epistasis, test cross, and modified epistasis respectively) but are not the Bateson-Punnett linkage ratio.

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