Linkage: When Genes Segregate Together — NEET Biology
📚 Practice ConceptMorgan carried out several dihybrid crosses in Drosophila to study genes that were sex-linked. The crosses were similar to the dihybrid crosses carried out by Mendel in peas. For example Morgan hybridised yellow-bodied, white-eyed females to brown-bodied, red-eyed males and intercrossed their F₁ progeny. He observed that the two genes did not segregate independently of each other and the F₂ ratio deviated very significantly from the 9:3:3:1 ratio (expected when the two genes are independent).
Q10. If in a dihybrid F₂ generation, the observed ratio deviates from 9:3:3:1, what could be a likely reason?
View solution & NCERT explanation
Correct answer: B — Linkage between genes
Linked genes do not assort independently and thus distort expected 9:3:3:1 ratios.
What does NCERT say about Morgan carried out several?
Has this concept appeared in NEET?
Which chapter is this from?
Through deep analysis of NEET and NTA, 176 of the 180 ReNEET 2026 (June 21) questions were already in the MedicNEET question bank before the exam.
176/180MedicNEET's Biology question bank is built from the same NCERT lines NTA picks repeatedly. Not random MCQs — questions crafted exactly like NTA crafts them.