. Mendel's law of segregation is based on the fact that genes are located on chromosomes and that

A. number of chromosomes is constant.

B. homologous chromosomes pair and segregate.

C. pairing of homologous chromosomes involve no crossing over.

D. number of chromosomes is variable.

B. It is based on the fact that genes are located on chromosomes and during the process of division, homologous chromosomes pair and segregate.

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