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NEETZoologyPrinciples of Inheritance and Variation

Read the following statements regarding linkage and recombination and choose the incorrect statement.

Options

  1. AAlfred Sturtevant used the frequency of recombination between gene pairs on the same chromosome as a measure o
  2. BWhen two genes in a dihybrid cross are situated on the same chromosome, the proportion of parental gene combin
  3. CLoosely linked genes grouped on the same chromosome show a higher frequency of recombination compared to tight
  4. DGenes that are tightly linked on the same chromosome show a high frequency of non-parental gene combinations.

Correct answer

D. Genes that are tightly linked on the same chromosome show a high frequency of non-parental gene combinations.

Step-by-step solution

According to Morgan's experiments on Drosophila, genes that are tightly linked on the same chromosome show very low recombination (non-parental gene combinations) and a very high proportion of parental gene combinations. Therefore, the statement claiming that tightly linked genes show a high frequency of non-parental combinations is incorrect. Alfred Sturtevant used recombination frequencies to map gene positions, which is a correct statement. When genes are on the same chromosome, they tend to be inherited togethe

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