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Which of the following occurs in Meiosis but not in Mitosis? Select the correct answer using the codes given below : A. independent assortment B. segregation of homologous chromosomes C. crossing over D. synapsis of homologues 

Which of the following occurs in Meiosis but not in Mitosis? Select the correct answer using the codes given below : A. independent assortment B. segregation of homologous chromosomes C. crossing over D. synapsis of homologues  Correct Answer A, B, C and D

The correct answer is A, B, C and D.

Concept:

Meiosis- 

  • Meiosis is the phenomenon which occurs in any life cycle.
  • Meiosis reduces the chromosome number in such a way that each daughter nuclei receives only one set of each kind of chromosome (i.e., maternal and paternal).

Explanation:

  • Independent assortment-
    • It states that when two pairs of traits are combined in a hybrid, segregation of one pair of characters is independent of the other pairs of characters.
    • In eukaryotes, the independent assortment of genes takes place during meiosis.
  • Segregation of homologous chromosomes-
    • ​It takes place in anaphase phase of meiosis.
    • In this phase, homologous chromosomes break their connection with each other and get separated.
    • This process of separation or segregation of homologous chromosomes is known as disjunction.
    • NOTE- The sister chromatid remains attached at their centromeres on the separation of the homologous chromosomes.
  • Crossing over-
    • It occurs between prophase I and metaphase I of meiosis.
    • Genetic material is exchanged between the non-sister chromatids of two homologous chromosomes during this process. It results in the the recombination of genetic material on the two chromosomes.
  • Synapsis of homologous-
    • It occurs in prophase I of meiosis.
    • In this phase, homologous chromosomes pair up. The genes of the same character on the two chromosomes are paired in such a way that they are exactly opposite each other. This process of association is known as Synapsis of homologous.

Thus, all these occur in Meiosis but not in Mitosis.

Related Questions

Which of the following occurs in Meiosis but not in Mitosis? Select the correct answer using the codes given below: A. independent assortment B. Segregation of homologous chromosomes C. crossing over D. synapsis of homologues
Consider the following statements regarding the pachytene substage of prophase I during meiosis and choose the correct answer:
1. Pachytene is said to begin when synapsis is completed
2. During pachytene the chromosomes are associated in bivalents or tetrads
3. Shortening and thickening of the chromosomes takes place due to longitudinal contraction
4. Exchange of groups of genes takes place as a result of crossing over
Consider the following statements regarding the significance of mitosis and choose the correct answer:
1. The constant number of chromosomes in all the cells of the body is because of mitosis
2. Mitosis restores the surface-volume ratio of the cell
3. A cell can grow in size to a large extent without disturbing the ratio between the nucleus and the cytoplasm
4. Repair of the body takes place because of addition of cells by mitosis
In one of the cytological slides, the homologous chromosomes are seen in synapsis; a protein containing synaptonemal complex is formed to facilitate crossing over. In which stage the above state of the cell is identified ?
S1: While crossing a busy road we should obey the policeman on duty.
P: We should always cross the road at the zebra crossing.
Q: We must look to the signal lights and cross the road only when the road is clear.
R: If there are no signal lights at the crossing, we should look to the right, then to the left and again to the right before crossing the road.
S: If the road is not clear we should wait.
S6: We should never run while crossing a road.

The Proper sequence should be:
One of the fundamental events that occur in meiosis is crossing over in which homologous chromosomes exchange segments causing a reshuffling of genes.
Consider the following statements regarding supernumerary chromosomes and choose the correct answer:
1. They are not homologous with any of the normal chromosomes
2. They form synapses among themselves
3. They are generally smaller than normal chromosomes
4. They are found more commonly in plants than in animals
The variations occurring due to meiosis are due to the independent segregation of chromosomes during Metaphase II.
Who interpreted by observing the independent segregation of chromosomes during meiosis, that the factors they carry would also separate independently?
Consider the following statements with regard to the functions of the centromere in the chromosome.
1. Centromeres are the centres of movement of the chromatids or chromosomes during anaphase separation.
2. Acentric chromosomes lack the capacity to segregate in a regular fashion.
3. Crosing-over in one arm of a metacentric chromosome does not affect the crossing over in the arm of the same chromosome.
Which of the statements given above are correct?