Gregor Johann Mendel

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"genes." When the gene has a
slighty different base sequence it is called an "allele."

Mendel also developed 3 laws or principles. The first principle is
called the, "Principle of Segregation." This principle states that the traits of
an organism are determined by individual units of heredity called genes. Both
adult organisms have one allele from each parent, which gives both organisms 2
alleles. The alleles are separated or "segregated" from each other with the
reproductive cell formation. Mendel's second principle is the, "Principle of
independent assortment." This principle states that the expression of a gene for
any single trait is usually not influenced by the expression of another trait.
Mendel's third and last principle is called the, "Principle of dominance." This
principle states that an organism with contrasting alleles for the same gene,
has one allele that maybe dominant over the other (as round is dominant over
wrinkled for seed shapes in pea-plants). All the ...

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