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Significance of Crossing Over

During, meios...

Question

During, meiosis-I, the bivalent chromosomes clearly appear as tetrads during:

A

Diakinesis

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B

Diplotene

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C

Leptotene

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D

Pachytene

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Solution

The correct option is D
Explanation of the correct option
During pachytene of meiosis-I, the paired chromosomes of each bivalent condense and become more distinct.
Further, sister chromatids in each chromosome become distinct due to the appearance of a longitudinal furrow.
Thus, each bivalent clearly appears as a tetrad consisting of four chromatids.

Final Answer: During, meiosis-I, the bivalent chromosomes clearly appear as tetrads during pachytene.

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Similar questions

Refer to the following statements describing Prophase I of meiosis and answer the question.
(i) Thin thread like chromosomes with a beaded appearance
(ii) Appearence of recombination nodules
(iii) Formation of bivalents/tetrads
(iv) Terminalisation of chiasmata
(v) Appearance of chiasmata
Arrange the given statements in the correct sequence of their occurrence during prophase I.

Q. The complex formed by a pair of synapsed homologous chromosomes is called :Homologous chromosome are paired and synapsed during zygotene stage of meiosis-I and known as bivalent

Q. Choose the correct answers from the alternatives given :
During prophase I of meiosis homologous chromosomes pair with each other to form bivalents A bivalent is an association of

Q. Tetrads are formed, during .......... phase of meiosis.

Refer to the following statements describing Prophase I of meiosis and answer the question.
(i) Thin thread like chromosomes with a beaded appearance
(ii) Appearence of recombination nodules
(iii) Formation of bivalents/tetrads
(iv) Terminalisation of chiasmata
(v) Appearance of chiasmata
Identify the different stages with respect to the above given features and select the correct option

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