How many sister chromatids are in the rice... | Microbiology | Agrigyan

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ICAR JRF Microbiology 29 Jun 2024Shift 1

MCQ (Single Correct) +4 −1

How many sister chromatids are in the rice (Oryza sativa) plant cell entering the first meiotic division?

24 12 48 Correct 6

Rice Chromosome Number: Cultivated rice (Oryza sativa) is a diploid species with $2n = 2x = 24$ chromosomes.
Meiotic S-phase & Chromatid Count: Prior to entering Prophase I of Meiosis I, the cell completes interphase DNA replication. Consequently, each of the 24 chromosomes consists of two identical sister chromatids joined at the centromere.
Calculation:

$$\text{Total Sister Chromatids} = 24 \text{ chromosomes} \times 2 = 48 \text{ sister chromatids}$$

Correct option: (3) 48

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