We all carry in our bodies
expressed and unexpressed genes. For example, a husband and wife couple
who both have black hair produce a child with blond hair. Would you call
that evolution? Where did the blond hair come from? Obviously, the
couple with black hair also were carrying genes for blond hair. The
genes for blond hair did not evolve. The genes for blond hair already
existed in the couple. However, the genes for blond hair were not
expressed in the couple carrying them. Only the genes for black hair
were expressed in the couple. Eventually, the genes for blond hair would
be expressed in a child they brought into the world.
Young people, and even adults, often wonder how all
the varieties or "races" of people could come from the same original
human ancestors. Well, in principle, that's no different than asking how
children with different color hair ( i.e., blond, brunette, brown, red )
can come from the same parents who both have black hair. Just as some
individuals today carry genes to produce descendants with different
color hair and eyes, humanity's first parents, Adam and Eve, possessed
genes to produce all the variety and races of men. You and I today may
not carry the genes to produce every variety or race of humans, but
humanity's first parents did possess such genes.
All varieties of humans carry genes for the same
basic traits, but not all humans carry every possible variation of those
genes. For example, one person may be carrying several variations of
the gene for eye color ( i.e., brown, green, blue), but someone else may
be carrying only one variation of the gene for eye color ( i.e.,
brown). Thus, both will have different abilities to affect the eye color
of their offspring.
Some parents with black hair, for example, are
capable of producing children with blond hair, but their blond children
(because they inherit only recessive genes) will not have the ability to
produce children with black hair unless they mate with someone else who
has black hair. If the blond descendants only mate with other blondes
then the entire line and population will only be blond even though the
original ancestor was black-haired.
The genes must first exist or otherwise the evolution
cannot occur. All real evolution simply is an expression over time of
what already existed previously in the genetic pool of a population.
Evolution just doesn't happen. Something has to
direct the formation and transformation of biological matter for
evolution to occur. That something is what we call genes. Genes are
located on the DNA molecule (the genetic code). DNA is the abbreviated
name for the genetic code and it is exactly that – a code. It is a
molecular string of chemical information.
