What chromosome were the genes located on that were used by Morgan in his dihybrid cross?(a) X chromosome(b) Y chromosome(c) W chromosome(d) Z chromosomeThis question was posed to me in class test.Question is taken from Inheritance Principles topic in section Principles of Inheritance and Variation of Biology – Class 12

What chromosome were the genes located on that were used by Morgan in

1.	What chromosome were the genes located on that were used by Morgan in his dihybrid cross?(a) X chromosome(b) Y chromosome(c) W chromosome(d) Z chromosomeThis question was posed to me in class test.Question is taken from Inheritance Principles topic in section Principles of Inheritance and Variation of Biology – Class 12
Answer» The correct option is (a) X CHROMOSOME To explain I would say: The genes were located on X-chromosome. These are called sex-linked genes because their EXPRESSION depends on the sex of the FLY. The X chromosome is present in copies of two in females, but the MALES have only one copy of X. Thus, a recessive mutant might remain SUPPRESSED in females, but the males will always exhibit the phenotype.

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