Q2 of 43 Page 52

Mitochondria and plastids have their own DNA (genetic material). What is known about their fate during nuclear division like mitosis?

DNApresent in mitochondria in plastids are called the extra chromosomal DNA.

They are independent of the nuclear division of the nuclear DNA. Hence, no effect of mitosis is seen on extra chromosomal DNA.


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14

In which phase of meiosis are the following formed? Choose the answers from hint points given below.

a. Synaptonemal complex ____________________________


b. Recombination nodules ____________________________


c. Appearance/activation of ____________________________


enzyme recombinase


d. Termination of chiasmata _ ___________________________


e. Interkinesis ____________________________


f. Formation of dyad of cells _ ___________________________


Hints : 1) Zygotene, 2) Pachytene, 3) Pachytene, 4) Diakinesis, 5) After Telophase-I /before Meosis-II, 6) Telophase-I /After Meiosis-I.


 1

State the role of centrioles other than spindle formation.

 3

Label the diagram and also determine the stage at which this structure is visible.

 4

A cell has 32 chromosomes. It undergoes mitotic division. What will be the chromosome number (N) during metaphase? What would be the DNA content (C) during anaphase?