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Question

One of the following shows complete linkage.
  1. Male Culex
  2. Male Drosophila
  3. Female Drosophila
  4. Neurospora

A
Male Culex
B
Male Drosophila
C
Neurospora
D
Female Drosophila
Solution
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In male Drosophila, complete linkage was observed. If linkage is complete, there should be parental combinations only and no recombination. Morgan reported a complete linkage in Drosophila. When ordinary male wild fly with grey body and normal wings were crossed with female having black body and vestigial wings, in F1, hybrids were all grey bodied and normal winged (with dominant characters). But when F1, male is back crossed with recessive female parent only two types of individuals in F2 generation were produced instead of expected four. These two types were grey bodied and normal winged and black bodied and vestigial winged in equal number, thus indicating the complete linkage.

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