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Types of Cell Division

The diagram g...

Question

The diagram given alongside represents a certain phenomenon which occurs during meiosis. Name and explain the phenomenon by using the terms - homologous chromosomes, chromatids, crossing-over. [3 MARKS]

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Solution

Naming: 1 Mark
Explanation: 2 Marks

The phenomenon represented by the diagram is chiasmata formation. During pairing, some chromatids of homologous chromosomes break and rejoin at points of intersection called chiasmata. This causes crossing over with exchange of chromatid material between chromosomes from the parents. This leads to a new combination of genes in the sex cells.

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Q. The diagram given below represents a certain phenomenon which occurs during meiosis, Name and explain the phenomenon by using the terms homologous chromosomes, chromatids, crossing over.

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

Maximum crossing over will occur between which genes.

Separation of homologous chromosomes and sister chromatids occurs during meiosis in

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.

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Types of Cell Division

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