The Mendel’s first law that a
characteristic (trait) an individual is
always by two factors, one
from the father and other
from the mother the direct offspring
of individual receives from it
one of these factors (). In other
words, each determined by two
factors segregate during gamete
formation.

The Mendel’s first is also known as
the law of purity of . Mendel
deduced the way genes and alleles were
transmitted traits were conditioned
without even knowing of the
of these elements.