Question

In Morgan’s dihybrid cross on Drosophila, white (w) and miniature (m) refer to the alleles controlling recessive traits for

• A. eye colour and body size
• B. body colour and eye colour
• 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 the Morgan’s dihybrid cross on Drosophila, several characters were studied and crosses were made to study the inheritance pattern of those characters.
The normal eye colour or wild type eye color of Drosophila is red. White eye color is a recessive trait that is caused due to mutation in the wild type allele.
The normal wing size remains the dominant trait. Miniature refers to the reduced wing size of Drosophila caused due to the 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.