Genotype Ratios in Random Fertilisation — NEET Biology
📚 Practice ConceptAs a result of random fertilisation, the resultant zygotes can be of the genotypes TT, Tt or tt.
Assertion (A): Polyploidy can result from errors in the final stages of cell division. Reason (R): Cytokinesis failure occurs before telophase stage completion, resulting in chromosome doubling.
View solution & NCERT explanation
Correct answer: A — If both assertion and reason are true and the reason is the correct explanation of the assertion.
NCERT confirms polyploidy results from cell division errors (Assertion true). However, NCERT states “Failure of cytokinesis after telophase stage of cell division results in an increase in a whole set of chromosomes” - the Reason reverses the sequence, claiming failure occurs before telophase rather than after, making it false.
What does NCERT say about As result random fertilisation?
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.