Question

Notched wing margin in female Drosophila is due to.

• A. Double recessive allele
• B. Dominant allele
• C. Homozygous deficiency
• D. Heterozygous deficiency

Answer 1

The correct option is B Dominant allele

Answer is option B i.e. "Dominant allele"
The Notch gene in female Drosophila was discovered by Morgan and colleagues. They observed that X-linked dominant mutations in Drosophila caused irregular notches at the wing margin. Notched wings were the result of a spontaneous mutation in X-chromosome. As X-chromosome in Drosophila carries dominant alleles, hence answer is "Dominant allele".