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NEL Cell Division 571

Section17.

• Cloning is the process of forming identical offspring from a single cell or tissue.


• Cloning permits the production of offspring with characteristics identical to
  those of the parent.


• Some plants and animals naturally clone themselves (reproduce asexually).


• Technologies have been developed to clone both plants and animals. Further
  development of cloning technology relies on increased understanding of cell
  processes such as mitosis.

SUMMARY Applications of the Cell Cycle

Section 17.2 Questions

1. Describe how nuclear transplants are used to clone frogs.
   2.Dolly was not the first cloned animal, nor was she the first
   mammal clone. What made her cloning so special?
   3.Explain why male animals would no longer be needed if
   cloning became the accepted method of reproduction.
   4.If the nucleus is extracted from an adult animal cell and
   placed into an enucleated egg, how would it be possible to
   distinguish the cloned individual from the original?
   5.Make a list of benefits and potential problems associated
   with cloning farm animals.

6.Speculate on the potential benefits and problems

associated with cloning humans.

7. Research the nature versus nurture debate and the
   evidence provided by studies of twins. Find out about
   some psychological conditions that have both a genetic
   and an environmental component. What are the
   advantages and disadvantages of each approach? Think
   about the social, moral, and ethical implications of each
   viewpoint.

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Purpose Design Analysis

Problem Materials Evaluation

Hypothesis Procedure Synthesis

Prediction Evidence

To perform this investigation, turn to page 589.

Identification of a Cancer Cell

Cancer cells have unique features that can be used to distinguish

them from non-cancerous cells. These differences can be used

by medical professionals as a means of detecting cancer, often in

earlier, easy-to-treat stages by technologies such as X-rays,

infrared photography, and cell biopsies. Some of these

differences can be viewed using a light microscope. What are

these differences? Do they relate to the ability of these cells to

continue undergoing mitosis?

In this investigation, you will examine stained slides of

cancerous and non-cancerous cells under a light microscope to

observe some differences between these cell types.

INVESTIGATION 17.2Introduction Report Checklist