AIIMS2018BotanyCell Cycle and Cell Division

Assertion: Bivalents are formed during pachynema. Reason: Bivalent and tetrad conditions of chromosomes are two different conditions.

Options

AIf both assertion and reason are true and reason is the correct explanation of assertion.
BIf both assertion and reason are true but reason is not the correct explanation of assertion.
CIf assertion is true but reason is false.
DIf both assertion and reason are false.

Correct answer

C. If assertion is true but reason is false.

Step-by-step solution

Pairing of the homologous chromosomes occurs during pachynema. Each bivalent or tetrad chromosome pair is made up of actually four chromatids, two of each chromosome.

Practice Cell Cycle and Cell Division on Quantrex Academy →

More from Cell Cycle and Cell Division

The correct sequence of adult cell cycle phases is __________. 2026 Match List I with List II : List I (Phase of cell cycle) List II (Activity) A. G₁ phase I. Actual cell division occurs B. S phase II. Cell is metabolically active and continuously 2026 Given below are two statements : Statement I : Chromosomes are fully condensed at the end of prophase I. Statement II : Meiosis I resembles mitosis. In the light of the above state 2026 What is the main function of the spindle fibers during mitosis? 2025 Match List-I with List-II. array |l|l|r|l| & array l List-I Event array & & array l List-II Stage of Prophase-I (Meiosis-I) array A. & Chiasmata formation & I. & Pachytene B. & Cro 2024 Match List-I with List-II array |l|l|l|l| & List-I & & List-II A. & Cells are metabolically active and proliferate & I. & G ₂ phase B. & DNA replication takes place & II. & G ₁ pha 2024 Recombination between homologous chromosomes is completed by the end of 2024 Given below are two statements: Statement I : Chromosomes become gradually visible under light microscope during leptotene stage. Statement II : The beginning of diplotene stage is 2024 Full Cell Cycle and Cell Division list All AIIMS PYQs