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NEETZoologyPrinciples of Inheritance and Variation

In Morgan's dihybrid crosses, what was observed about the segregation of genes on the X chromosome?

Options

  1. AThe genes segregated independently
  2. BThe genes did not segregate independently
  3. CThe genes were not located on the X chromosome
  4. DThe segregation was not affected by the chromosome location

Correct answer

B. The genes did not segregate independently

Step-by-step solution

Morgan carried out several dihybrid crosses in Drosophila to study genes that were sex-linked. The crosses were similar to the dihybrid crosses carried out by Mendel in peas. For example Morgan hybridized yellow-bodied, white-eyed females to brown-bodied, red-eyed males and intercrossed their F1 progeny. He observed that the two genes did not segregate independently of each other and the F2 ratio deviated very significantly from the 9:3:3:1 ratio (expected when the two genes are independent

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