B
It is during gamete formation stage, in a living organism, that segregation of gene pairs takes place.
Explanation:
Genes alleles occur in pairs in diploid organisms. Each allele is located in the same locus on either of the two homologous chromosomes. During gamete formation, the ploidy of the cell is halved. In meiosis and specifically at metaphase I, the two homologous chromosomes are separated each going to a separate gamete. Therefore gametes usually have one of a set of all gene alleles.
Learn More:
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