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A cell at telophase stage is observed by a student in a plant brought from the field. He tells his teacher that this cell is not like other cells at telophase stage. There is no formation of cell plate and thus the cell is containing more number of chromosomes as compared to other dividing cells. This would result in
  1. Aneuploidy
  2. Polyploidy
  3. Somaclonal variation
  4. Polyteny

A
Polyploidy
B
Polyteny
C
Aneuploidy
D
Somaclonal variation
Solution
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Polyploids arise when a rare mitotic or meiotic catastrophe, such as nondisjunction, causes the formation of gametes that have a complete set of duplicate chromosomes. Diploid gametes are frequently formed in this way. When a diploid gamete fuses with a haploid gamete, a triploid zygote forms, although these triploids are generally unstable and can often be sterile. Many types of polyploids are found in nature, including tetraploids (four sets of chromosomes), hexaploids (six sets of chromosomes), and other chromosome-pair multiples. Polyploidy may occur due to abnormal cell division, either during mitosis, or commonly during metaphase I in meiosis.

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Q1
A cell at telophase stage is observed by a student in a plant brought from the field. He tells his teacher that this cell is not like other cells at telophase stage. There is no formation of cell plate and thus the cell is containing more number of chromosomes as compared to other dividing cells. This would result in:
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While performing an experiment, a student observed a cell under the microscope undergoing mitosis is at the telophase stage but not showing any furrow initiation. What can be the possible consequence of this?
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Failure of cytokinesis after telophase stage of cell division result in an increase in a whole set of chromosomes in an organism and this phenomenon known as polyploidy is often seen in
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Q5
A biologist examines a series of cells and counts 160 cells in interphase, 20 cells in prophase, 6 cells in prometaphase, 2 cells in metaphase, 7 cells in anaphase, and 5 cells in telophase. If the complete cell cycle requires 24 hours, what is the average duration of M phase in these cells ?
Stage Number of cells Proportion of cells Average duration
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Interphase 1600.809.2
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Anaphase 70.0350.84
Telophase 50.0250.6
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