In which sub-stages of meiosis-I do the following events occur?
i) pairing of homologous chromosomes
ii) terminalization
ii) crossing over
iv) formation of spindle apparatus.

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Solution

In Meiosis I the following events occur as
I) pairing of homologous chromosomes - Prophase I, Zygotene
ii) Terminalization - Prophase I, Dikinesis
iii) crossing over - Prophase I, Pachytene
iv) formation of spindle apparatus - Metaphase I

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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. Match the stages of meiosis in Column-I to their characteristic features in Column-II and select the correct option using the codes given below:
Column I Column II

a. Pachytene	1. Pairing of homologous chromosomes
b. Metaphase I	2. Terminalization of chiasmata
c. Diakinesis	3. Crossing-over takes place
d. Zygotene	4. Chromosomes align at equatorial plate

Q. Assertion :Meiosis-I is called reductional division in which crossing over occur between homologous chromosomes and as end product each cell receives one set of chromosomes. Reason: Meiosis II is same as Mitosis.

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

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In which sub-stages of meiosis-I do the following events occur?i) pairing of homologous chromosomes ii) terminalizationii) crossing over iv) formation of spindle apparatus.

In Meiosis I the following events occur as I) pairing of homologous chromosomes - Prophase I, Zygoteneii) Terminalization - Prophase I, Dikinesisiii) crossing over - Prophase I, Pachyteneiv) formation of spindle apparatus - Metaphase I

In which sub-stages of meiosis-I do the following events occur?
i) pairing of homologous chromosomes
ii) terminalization
ii) crossing over
iv) formation of spindle apparatus.

In Meiosis I the following events occur as
I) pairing of homologous chromosomes - Prophase I, Zygotene
ii) Terminalization - Prophase I, Dikinesis
iii) crossing over - Prophase I, Pachytene
iv) formation of spindle apparatus - Metaphase I