What Is Reproductive Cloning, and Has It Ever Been Shown

question 12

Multiple Choice

What is reproductive cloning, and has it ever been shown to work?

• A) A nucleus from a parent cell is placed into an egg with the nucleus removed. The resulting embryo is implanted into a surrogate mother and is identical to the parent. No, this has never resulted in a live birth.
• B) A nucleus from a parent cell is placed into an egg with the nucleus removed. The resulting embryo is implanted into a surrogate mother and is identical to the parent. Yes, this has been done with a variety of animals.
• C) A nucleus from a parent cell is placed into an egg with the nucleus removed. The resulting embryo is grown up in the lab and is identical to the parent. No, this has never resulted in a live birth.
• D) A nucleus from a parent cell is placed into an egg with the nucleus removed. The resulting embryo is grown up in the lab and is identical to the parent. Yes, this has been done with a variety of animals.
• E) DNA from any individual can be cultured into an organism that exactly matches the original parental source of the DNA. People are increasingly doing this with valuable animals and pets.

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Definitions:

Diffusion

The movement of molecules or particles from regions of higher concentration to regions of lower concentration.

Physiological Dead Air Space

The volume of the airways where gas exchange does not occur, including parts of the bronchial tree and trachea.

Anatomic Dead Space

The portion of the respiratory system where gas exchange does not occur, including the nose, trachea, and bronchi, where air is moved in and out without being involved in oxygen/carbon dioxide exchange.

Respiratory Membrane

The thin barrier through which gas exchange occurs between the air in the lungs and the blood in capillaries.