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Q.

Read the following statements and choose the correct one with respect to bivalents? 

(i) These are formed during zygotene 

(ii) Each bivalent has four chromosomes

(iii) Each bivalent has four chromatids 

(iv) Bivalent is also called as tetrad.

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a

(iii) and (iv) only

b

(i), (ii) and (iii) only

c

(i), (iii) and (iv) only

d

(i), (ii), (iii) and (iv)

answer is C.

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Detailed Solution

Bivalents are formed in zygotene and they are referred as tetrads because in pachytene four chromatids are clearly seen in each bivalent which is maintained till metaphase I.

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