BIOTECHNOLOGY
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human agriculture and childbirth, both of which
are focal areas of biotechnology.
By the time of Charles Darwin (1809–1882),
plant and animal breeders were deliberate and
highly successful in applying techniques of selec-
tive breeding to achieve specific, intended results.
Darwin’s theory of evolution is built in part on his
observation of the ability of animal breeders to
modify species. The work of human breeders
helped Darwin see that species are variable, dy-
namic, and subject to change. Inspired by the suc-
cess of intentional selective breeding, Darwin pro-
posed his theory of natural selection, by which
nature unintentionally acts something like a
human breeder. Nature, however, uses environ-
mental selection, which favors certain individuals
over others in breeding. The theory of natural se-
lection, of course, led to a profound shift in
human consciousness about the fluidity of life,
which in turn fueled modern biotechnology and
its view that life may be improved. While Chris-
tianity struggled with other implications of Dar-
winism, it did not object to the prospect that
human beings can modify nature, perhaps even
human nature.
The emergence of modern biotechnology
In the twentieth century, as biologists refined Dar-
win’s proposal and explored its relationship to ge-
netics, plant breeders such as Luther Burbank
(1849–1926) and Norman Borlaug (1914– ) took
selective breeding to new levels of success, signif-
icantly increasing the quality and quantity of basic
food crops. But it was the late twentieth-century
breakthroughs in molecular biology and genetic
engineering that established the technological
basis for modern biotechnology. The discovery
that units of hereditary information, or genes, re-
side in cells in a long molecule called deoxyri-
bonucleic acid (or DNA) led to an understanding
of the structure of DNA and the technology to ma-
nipulate it. Biotechnology is no longer limited to
the genes found in nature or to those that could be
moved within a species by breeding. Bioengineers
can move genes from one species to another, from
bacteria to human beings, and they can modify
them within organisms.
The discovery in 1953 of the structure of DNA
by Francis Crick (b. 1916) and James Watson (b.
1928) is but one key step in the story of molecular
biology. Within two decades, this discovery
opened the pathway to the knowledge of the so-
called genetic alphabet or code of chemical bases
that carry genetic information, an understanding of
the relationship between that code and the pro-
teins that result from it, and the ability to modify
these structures and processes (genetic engineer-
ing). The decade of the 1980s saw the first trans-
genic mammals, which are mammals engineered
to carry a gene from other species and to transmit
it to their offspring, as well as important advances
in the ability to multiply copies of DNA (poly-
merase chain reaction or PCR). The Human
Genome Project, an international effort begun
around 1990 to detail the entire DNA information
contained in human cells, sparked the develop-
ment of bioinfomatics, the use of powerful com-
puters to acquire, store, share, and sort genetic in-
formation. As a result, not only is a standard
human DNA sequence fully known (published in
February 2001), but it is now possible to determine
the detailed code in any DNA strand quickly and
cheaply, a development likely to have wide appli-
cations in medicine and beyond.
Biotechnology is also dependent upon embry-
ology and reproductive technology, a set of tech-
niques by which animal reproduction is assisted or
modified. These techniques were developed largely
for agricultural purposes and include artificial in-
semination, in vitro fertilization, and other ways of
manipulating embryos or the gametes that produce
them. In 1978, the first in vitro human being was
born, and new techniques are being added to what
reproductive clinics can do to help women achieve
pregnancy. These developments have been op-
posed by many Orthodox Christian and Roman
Catholic theologians, by the Vatican, and by some
Protestants, notably Paul Ramsey. Other faith tradi-
tions have generally accepted these technologies.
In addition, some feminist scholars have criticized
reproductive medicine as meeting the desires of
men at the expense of women and their health.
Reproductive medicine, however it may be as-
sessed on its own merits, does raise new concerns
when it is joined with other forms of biotechnol-
ogy, such as genetic testing and genetic engineer-
ing. In the 1990s, in vitro fertilization was joined
with genetic testing, allowing physicians to work
with couples at risk for a genetic disease by offer-
ing them the option of conceiving multiple em-
bryos, screening them for disease before implanta-
tion, and implanting only those that were not likely