All About Penguins by Kay Winnit

By Kay Winnit

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Cloning of any DNA sequence involves the following four steps: amplification, ligation, transfection, and screening/selection. • The first mammal to be cloned was a sheep called Dolly. She was born on July 5, 1996, at the Roslin Institute, Edinburgh, Scotland. • Biomedical scientists use stem cells to generate all the other specialized types of cells in the human body. Bone marrow is a rich source of stem cells. Endocrine System T he endocrine system is a system of ductless glands in the human body.

Testicles produce and store millions of sperm cells. • Testosterone is the hormone that causes males to develop deeper voices, bigger muscles, and body and facial hair, and it stimulates the production of sperm. Female Reproductive System T he female reproductive system is a group of organs that are necessary for reproduction. It includes ovaries, fallopian tubes, uterus, and vagina. The female reproductive system enables a woman to give birth to a child. It produces eggs, and protects and nourishes the fertilized egg until it is fully developed.

Hormones are known to be the main culprit for acne. • The full cycle of acne generally lasts about 8 weeks. • Laser therapy, chemical peels, dermabrasion, and other treatments have been suggested for acne scarring. Inflammatory Acne The papule is a small, solid, usually inflammatory elevation of the skin that does not contain pus. Hormonal Changes Acne is caused due to changes in hormones during the menstrual cycle. 61 Cancer C ancer is the uncontrolled growth of cells. Cancerous cells can spread in any tissue of the body.

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