If the ratio of X/A is 1.0 in Drosophila, the individual is – (RJ AARO Botany 2022)

✅Explanation: :In Drosophila, the sex of an individual is determined by the ratio of X chromosomes to autosomes (A). A ratio of 1.0 indicates an equal number of X chromosomes and autosomes, which is characteristic of females. In contrast, males have a ratio of 0.5.

📌Other Options Explanations:
-Option C: A super male has more than two X chromosomes with a normal number of autosomes.
-Option D: A super female has more than two X chromosomes with a reduced number of autosomes.

🔴 Related Information:According to the theory of genetic balance:
-Gene ratio (X/A) of 1.0 produces fertile females.
-Gene ratio (X/A) of 0.5 indicates productive males.
-Gene ratio less than 0.5 produces infertile meta-males (super males).
-Gene ratio 1.5 produces sterile meta-females (super females).
Chromosome Complement = X / A Ratio → Sexual Morphology
-XXX + 2A: X/A ratio = 3/2 or 1.5 → Metafemale
-XXX + 3A: X/A ratio = 3/3 or 1.0 → Female
-XX + 2A: X/A ratio = 2/2 or 1.0 → Female
-XX + 3A: X/A ratio = 2/3 or 0.67 → Intersex
-XXX + 4A: X/A ratio = 3/4 or 0.75 → Intersex
-XO + 2A: X/A ratio = 1/2 or 0.5 → Male
-XY + 2A: X/A ratio = 1/2 or 0.5 → Male
-XY + 3A: X/A ratio = 1/3 or 0 → Metamale