Synaptinemal complex occurs when associated with which of the following?

Paired chromosomes in mitosis.

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Paired chromosomes in meiosis.

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Unpaired chromosomes in mitosis.

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Non-sister chromosomes in mitosis.

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Solution

The correct option is B Paired chromosomes in meiosis.
Meiosis is characterised by pairing of homologous chromosomes, exchange of segments between homologous chromosomes and separation of homologous chromosomes. The pairing of homologous chromosomes occurs during zygotene substage of prophase I which lead to formation of bivalent. The two homologous chromosomes of a bivalent are held together by nucleoprotein core. The whole structure is called synaptinemal or synaptonemal complex.

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Similar questions

Fill in the blanks
(a) Mitosis occurs in our ..... cells.
(b) Mitosis produces two daughter cells whereas meiosis produces ...... daughter cells.
(c) Meiosis occurs only in ..... cells.
(d) Modern humans have 46 chromosomes. Their sperms and eggs will have......chromosomes each.
(e) During the pairing of chromosomes in meiosis, the ...... chromosomes come to lie side by side.
(f) The.......(s) are surrounded by radiating rays and termed as aster.

Q. How the daughter cell in mitosis different from meiosis if both of them have 46 chromosomes but the only difference is that in mitosis it get chromosomes from one parent and in meiosis it get chromosomes from two parents.

Q. Assertion: Mitosis is known as equational division and meiosis is known as reduction division.
Reason: During meiosis, the non-sister chromatids of homologous chromosomes cross-over and exchange genetic information. This step does not occur during mitosis.

Q. How many chromosomes are in each daughter cell in mitosis and meiosis respectively ?

Q. Fill in the blanks
1. Mitosis is a type of cell Division takes place in_____ cell
2. Meiosis is a type of cell Division takes place in_______ cell
3. In mitosis the chromosome number_____
4. In meiosis the chromosome number_____
5. Mitosis occurs at the time of_________reproduction
6. Meiosis occurs at the time of _________ reproduction

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