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Biology · 2025 · 2 marks
CBSE 2025 · Region 7 · Set 2 · Q21
(a) Write the scientific name of the fruit fly. (b) Why did Morgan prefer to work with fruit flies for his experiments? State two reasons.
(a)
Write the scientific name of the fruit fly.
(b)
Why did Morgan prefer to work with fruit flies for his experiments? State two reasons.
Marking-scheme solution
(a)
Drosophila melanogaster
(b)
-Could be grown on simple synthetic medium in laboratory.
-Complete life cycle in $\displaystyle 2$ weeks / short life span
-Single mating produce large number of flies.
-Clear difference between male and female /shows sexual dimorphism
-Many types of hereditary variations seen under low power of microscopes.
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