Chapter 12: Genetic Engineering


11 Δεκ 2012 (πριν από 4 χρόνια και 8 μήνες)

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Chapter 12: Genetic Engineering

Section 3: The New Human Genetics

The New Human Genetics

The rapid development of ______________________________________ has
produced a number of other developments




g the entire human

All the genes possessed by _______________________


Apply molecular biology to _____________________________________
and the _________________________________________

Analyzing Human DNA

Researchers have already d
eveloped tests for genetic disorders

Researchers have also begun to look for genes that might predispose individuals
to other medical problems, such as __________________________________,
______________________, and _____________________


If tests that iden
tify individuals at risk can be developed, early medical
attention would be able to prolong many lives

DNA Fingerprinting

There is a large amount of “_____________________”

DNA that does not
code for protein

in the human genome


Junk DNA is made up of r
epeated sequences that are called


Although individuals may have identical genes, there may be different
numbers of repeats between these genes


The more repeats, the longer the junk DNA between genes

Restriction enzymes are used to cut
DNA into fragments

The DNA fragments are carefully _____________________________________


The fragments are separated according to their _______________ by the
process of _________________________________


The DNA fragments that contain ___________________ a
re detected by
using _________________________________


The probes are radioactively labeled pieces of nucleic acids whose bases
are complementary to those of the repeats


The probes match up with the repeats and stick to them


This produces a pattern of radi
oactive bands


Genetic Engineering of Humans

Because humans, too, are animals there is no technical barrier to the insertion of
foreign genes into human cells

The production of transgenic animals

inserting DNA

into fertilized eggs and
then transplanting the eggs back into the female reproductive tract

serves as a

It is safe to predict that attempts to use genetic engineering to correct human
enetic disorders will continue

Ethical Issues

There are problems, risks, and doubts that have persuaded many scientists that
the time is not yet right to carry out these procedures on human beings

What will be the consequences if we develop the ability to
ourselves by making identical genetic copies of our own cells?

As our power over nature increases, our society shall have to learn to use wisely
the tools that science has given us