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NEETZoologyPrinciples of Inheritance and Variation

According to Morgan's findings, what was the proportion of parental gene combinations compared to non-parental types when genes were on the same chromosome?

Options

  1. AParental gene combinations were lower
  2. BParental gene combinations were equal
  3. CParental gene combinations were much higher
  4. DNon-parental gene combinations were higher

Correct answer

C. Parental gene combinations were much higher

Step-by-step solution

Morgan and his group knew that the genes were located on the X chromosome (Section 4.4) and saw quickly that when the two genes in a dihybrid cross were situated on the same chromosome, the proportion of parental gene combinations were much higher than the non-parental type. Morgan attributed this due to the physical association or linkage of the two genes and coined the term linkage to describe this physical association of genes on a chromosome and the term recombination to describe the generation of non-parental

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