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When humans and fruit flies are compared genetically, it is seen that ----.
Over billions of years, life has evolved into a
spectacular diversity of forms – more than a million
species presently exist. For each, the source of its
uniqueness is the particular combination of proteins
found within its cells. Yet in the midst of this diversity,
the similarities between living things are profound.
For example, although the fruit fly genome encodes
about 14,000 different proteins, and humans have
two to three times that number, many proteins are
still recognizably similar in sequence and task,
reflecting their common ancestry. In fact, when
scientists have put human disease genes into flies,
they often cause the same symptoms in the insects
as they do in people. Furthermore, addition of a
normal human gene can sometimes compensate for
the deletion of the same gene from the fly.