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Pachytene

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Question

Select the incorrectly matched pair.

A

Phragmoplast - Persistent spindle

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B

Reductional division - Meiosis I

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C

Equational division - Meiosis II

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D

Crossing over - Non - homologous chromosomes

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Solution

The correct option is D Crossing over - Non - homologous chromosomes
Crossing over takes place between non sister chromatids of homologous chromosomes in the pachytene sub stage of Prophase I of meiosis I
So, the correct option is 'Crossing over - Non - homologous chromosomes'

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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. 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. What are homologous chromosomes? Name the stage of cell division in which paired homologous chromosomes get shortened & thickened. What happen to homologous chromosomes during meiosis?

Q. The diagram opposite show a pair of homologous chromosomes during meiosis-

Maximum crossing over will occur between which genes.

Q. Fill in the blanks with appropriate words.
Synapsis, chiasma formation and crossing over occur between homologous chromosomes in .......... of meiosis.

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