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How are cell functions regulated?
** All this gene regulation allows cells and organisms to respond to their environment and control their growth and division.
Body cells of an individual can be very different from each other, even though they have descended from a single cell (zygote) and have essentially the same genetic
instructions. This is because different parts of these instructions are used in different types of cells, influenced by the cells environment and developmental history.
** This technique shows great promise in agriculture. Plants with desirable qualities can be rapidly produced from the cells of a single plant. What are the drawbacks???
Image from: http://www.iss.k12.nc.us/schools/scavenger/tggenetics.html
Or, probably more importantly a new way to feed the world?????
Image from: http://megcooperation.gov.in/model-baproj/model%20scheme3/bt/ptc.ht2.gif
Genetic engineering: ( )
** A cell can synthesize a new chemical coded for by its new gene(s)
-- examples include interferon, insulin, and growth hormone.
Genetic engineering can
restriction enzymes –
Characteristics produced by the segments of DNA may be expressed when these segments are inserted into new organisms such as bacteria.
Inserting, deleting, or altering DNA segments can alter genes. An altered gene may be passed on to every cell that develops from it.
human genome project ---
A down side to this is that health insurance agencies and other organizations may use this genetic information against individuals.
Substances from genetically engineered organisms may reduce the cost and side effects of replacing body chemicals. Human insulin produced in bacteria is already an example of this.
Secret of Photo 51 Video Worksheet Living Environment: Comet
Directions: Answer the following questions as you view the Nova video entitled “Secret of Photo 51”. Ask your instructor to pause the program if you get terribly behind, but not after each question you might miss. You may also complete the photo quiz of this program at your instructor’s discretion.
omparison of a “Modern” View and Photo 51
Video Guide: “Secret of Photo 51” Living Environment: Comet
Directions: Watch for these faces as you view the Nova video entitled “Secret of Photo 51”. Make certain to pay attention to the video AND answer the questions. Ask your instructor to stop the video and review certain portions of the program so that you can fully understand the history behind the discovery of the DNA molecule.