Principles of Inheritance and Variation — NEET/JEE Questions, Notes & Weightage
Covers Mendelian genetics, dihybrid/monohybrid crosses, deviations from Mendelism (codominance, multiple alleles), linkage, sex determination, and human genetic disorders (pedigree analysis). One of NEET Biology's single highest-weightage chapters, with genetics numericals appearing almost every year.
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Frequently asked questions
Why is this chapter consistently so high-yield for NEET?
It combines conceptual theory with calculable genetics problems (cross ratios, probability) — giving examiners both factual and numerical question formats from the same chapter.
What genetics numericals should I practise most?
Dihybrid cross ratios, test-cross outcomes, and pedigree-analysis problems for sex-linked disorders (haemophilia, colour blindness) are the most frequently asked numerical formats.
Are human genetic disorders (Down syndrome, haemophilia, etc.) tested directly?
Yes — both chromosomal disorders (Down, Klinefelter, Turner syndrome) and Mendelian disorders (haemophilia, sickle-cell anaemia, colour blindness) are regularly asked, often via inheritance pattern questions.