Mendel’s first law is also known as the law of segregation.
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The rules or postulates proposed by Mendel based on the observations made in monohybrid cross are now, known as laws or principles of inheritance. The first law is known as the law of dominance which states that characters are controlled by discrete units called factors. Factors occur in pairs. In a dissimilar pair of factors one member of the pair dominates (dominant) the other (recessive).