Q.

If a diploid cell carries 24 chromosomes, what will be the number of tetrads during its pachytene stage?

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a

48

b

24

c

12

d

6

answer is D.

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Detailed Solution

During the pachytene stage of prophase I in meiosis, homologous chromosomes pair up to form bivalents or tetrads. Each tetrad consists of four chromatids, with two chromatids from each homologous chromosome.

Since the cell is diploid and carries 24 chromosomes, it has 12 pairs of homologous chromosomes.

Each pair of homologous chromosomes forms one tetrad during the pachytene stage.

So, the number of tetrads during the pachytene stage is equal to the number of pairs of homologous chromosomes, which is 12.

Therefore, during its pachytene stage, the diploid cell with 24 chromosomes will have 12 tetrads.

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