An organism that has been extensively used to test the chromosomes theory of heredity is
Drosophila melanogaster
Muscar domestica
Zea mays
Homo sapiens
Explanation
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Drosophila... is not housefly. it's the fruitfly. it was used by Morgan to study about chromosomes in genetics following Mendel's discoveries.
A. Drosophila melanogaster (fruit fly)
Explanation:
Drosophila melanogaster (the common fruit fly) has been the primary model organism for testing the chromosome theory of heredity due to:
Simple Genetics: Only 4 pairs of chromosomes, making it easy to study inheritance patterns.
Short Life Cycle: Completes generations in ~10–14 days, allowing rapid observation of traits.
Visible Mutations: Traits like eye color (white vs. red) and wing shape are linked to specific chromosomes.
Thomas Hunt Morgan’s Work: In the early 1900s, Morgan used Drosophila to prove that genes are located on chromosomes (Nobel Prize, 1933).
Ans:A
The organism used to test the chromosome theory of heredity is the common fruit fly (Drosophila melanogaster).This is because it has a short life cycle and can lay hundreds of eggs.
