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Question

A tetrad is made of:  
  1. Four non-homologous chromatids 
  2. Four homologous chromosomes with four chromatids 
  3. Four non-homologous chromosomes 
  4. Two homologous chromosomes each with two chromatids 


Solution

The correct option is D Two homologous chromosomes each with two chromatids 
Tetrads are formed in prophase-I of meiosis I. A tetrad consists of two homologous chromosomes, each with two chromatids. Thus, it consists of 4 chromatids. The two chromatids that belong to the same chromosome are called sister chromatids and are joined at the centromere.

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