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Cell Cycle And Cell Division

Question
CBSEENBI11002241
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Given below is the representation of a certain event at a particular stage of a type of cell division. Which is this stage?

  • Prophase-I during meiosis

  • Prophase-II during meiosis

  • Prophase of mitosis

  • Both prophase and metaphase of mitosis

Solution

A.

Prophase-I during meiosis

The figure shows zygotine stage of prophase-I of meiosis-I. During this stage, bivalent chromosomes clearly appear as tetrads, Pachytene stage is characterized by the appearance of recombination nodules, the sites at which crossing over (exchange of genetic material) occurs between non-sister chromatids of the homologous chromosomes.

Some More Questions From Cell Cycle and Cell Division Chapter

What is polyteny ?

 Namethe five phases of of Prophase I.

 What are two types of cells on the basis of presence or absence of nucleus ?

Name an important event that occurs during meiosis and not during mitosis.

Name a cell that has half the number of chromosomes. Name the process responsible for the reduced number.

Name the sub-stage of meiosis in which crossing over takes place.

At which stage of mitosis, the two chromatids of each chromosome separate and move towards opposite poles.

Name the cell division which is responsible for growth and healing of wounds.

What type of cell division can produce variations ?

Name the active site of meiosis in flowering plants.

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