Law of Segregation (Law of Purity of Gametes)

2. Law of segregation (Law of purity of gametes) :

The Law of Segregation, also called the Law of Purity of Gametes, explains why a trait that vanishes in F1 reappears in F2. Mendel reasoned that the two alleles for a character never physically blend inside the hybrid; they remain distinct entities that are recovered intact in F2, even though only one of them (the dominant one) is visible at the F1 stage. This can only happen if, during gamete formation, the paired alleles separate cleanly from one another so that each gamete receives just one allele — otherwise the recessive form could never re-emerge in the next generation. …