Question

In Drosophila melanogaster, white (w) and miniature (m) refer to the alleles controlling recessive traits for

• A. body colour and eye colour
• B. eye colour and body size
• C. eye colour and wing size
• D. wing size and body size

Answer 1

The correct option is C eye colour and wing size

In Morgan's dihybrid cross on Drosophila melanogaster, several characters were studied and crosses were made to observe the inheritance pattern of those characters.
The normal eye colour/ wild type eye colour of Drosophila is red. White eye colour is a recessive trait that was produced by mutation in the wild-type allele.

The normal wing size is a wild-type or dominant trait. Miniature refers to the reduced wing size of Drosophila produced by mutations in the allele encoding wild-type wing size. It is a recessive trait.

Both the genes controlling the characters of eye colour and wing size in Drosophila are located on the X chromosome as was revealed by Morgan’s experiments.