Statement I: Synapsis is the process of pairing of homologous chromosomes.
Statement II: Crossing over occurs between sister chromatids of homologous chromosomes.
Which of the above statements are correct?

Only I

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Only II

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Both I and II

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Both the statements are wrong

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Solution

The correct option is A Only I
Synapsis occurs during the zygotene stage of prophase I of meiosis I. It is the process of pairing up of homologous chromosomes.

During the pachytene stage of prophase I of meiosis I, the non-sister chromatids of the homologous chromosomes crossover and exchange genetic information. This leads to the recombination of the genetic material.
The image given below shows the process of crossing over:

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Similar questions

Q. Name the stage of cell cycle at which one of the following events occurs. (i) Chromosomes are moved to spindle equator. (ii) Centromere splits and chromatids separate. (iii) Pairing between homologous chromosomes takes place. (iv) Crossing over between homologous chromosomes takes place.

Name the stage of the cell cycle at which one of the following events occur:

(i) Chromosomes are moved to the spindle equator
(ii) Centromere splits and chromatids separate
(iii) Pairing between homologous chromosomes takes place
(iv) Crossing over between homologous chromosomes takes place

Q. Four different steps that occur during meiosis are given in the following list :
(i) Complete separation of chromatids
(ii) Pairing of homologous chromosome
(iii) Linning up of paired chromosome on the equatorial plane
(iv) Crossing over between chromatids

Q. Select the correct option:

Four different steps that occur during meiosis are given in the following list.
(i) Complete separation of chromatids
(ii) Pairing of homologous chromosomes
(iii) Lining up of paired chromosomes on equator
(iv) Crossing over between chromatids
Select the correct sequential arrangement of the steps.

Q. Match the description (given in column I) with correct stage of prophase I (given column II) and choose the correct option. Column I Column II

A) Chromosomes are moved to spindle equator	1) Pachytene
B) Centromere splits and chromatids move apart	2) Zygotene
C) Pairing between homologous chromosomes takes place	3) Anaphase
D) Crossing over between homologous chromosomes takes place	4) Metaphase

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Pachytene

Standard XII Biology

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Statement I: Synapsis is the process of pairing of homologous chromosomes. Statement II: Crossing over occurs between sister chromatids of homologous chromosomes. Which of the above statements are correct?

Statement I: Synapsis is the process of pairing of homologous chromosomes.
Statement II: Crossing over occurs between sister chromatids of homologous chromosomes.
Which of the above statements are correct?