The number of tetrads present in pachytene and Metaphase-I of Allium cepa respectively

16

and

8

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16

and

16

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8

and

8

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16

and

32

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Solution

The correct option is B $8$ and $8$
Tetrads are 4 chromatids belonging to a homologous pair of chromosomes. A cell continues to possess the paired state until it completes Anaphase I of meiosis.
So, there is no change in number whatsoever upto the completion of Metaphase I.
Homologous chromosomes appear as tetrads during the Pachytene stage of Prophase I of Meiosis I, for exchange of genetic material between non-sister chromatids. The tetrad stage continues upto Metaphase I of Meiosis I
So, the correct answer is '8 and 8'

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Similar questions

L = {sin}^{2} (\frac{π}{16}) - {sin}^{2} (\frac{π}{8})

M = {cos}^{2} (\frac{π}{16}) - {sin}^{2} (\frac{π}{8}),

8163264

(A \cup B)^{'}

(A \cap B)^{'}

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