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- #Cell Structure and Function
Match the stages of meiosis in Column I to their characteristic feature in Column II and select the correct option using the codes given below:
| Column I | Column II |
|
a. Pachytene |
(i) Paring of homologous chromosomes |
|
b. Metaphase I |
(ii) Terminalization of chiasmata |
|
c. Diakinesis |
(iii) Crossing-over takes place |
| d. Zygotene |
(iv) Chromosomes align at equatorial plate |
Codes :
a b c d
- Option 1)
(iii) (iv) (ii) (i)
- Option 2)
(i) (iv) (ii) (iii)
- Option 3)
(ii) (iv) (iii) (i)
- Option 4)
(iv) (iii) (ii) (i)
Answers (1)
As learnt in
Pachytene -
The third stage of prophase I, bivalent chromosomes clearly appears as tetrads, crossing over between homologous chromosomes occur.
- wherein
Metaphase I -
The bivalents chromosomes align on the equatorial plate of spindle. The microtubes from the opposite poles of the spindle attach to the pair of homologous chromosomes.
- wherein
Diakinesis -
Final Stage of prophase -I marked by terminalisation of chaismata. Chromosomes are fully condensed and -meiotic spindle is assembled to prepare the homologous chromosome for seperation.
- wherein
Zygotene -
The second stage of Prophase I. Chromosomes starts pairing together in a process called synapsis. Each paired chromosome is homologous. Synapsis is accompanied by the formation of the complex structures-synaptonemal complex.
- wherein
Different stages of cell division with their characteristics
a) - (iii)
b) - (iv)
c) - (ii)
d) - (i)
Option 1)
(iii) (iv) (ii) (i)
This answer is correct
Option 2)
(i) (iv) (ii) (iii)
This answer is incorrect
Option 3)
(ii) (iv) (iii) (i)
This answer is incorrect
Option 4)
(iv) (iii) (ii) (i)
This answer is incorrect
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