By Faith Hickman Brynie

Makes use of a question-and-answer layout to give information regarding actual, clinical, and social matters surrounding human replica, together with contraception, being pregnant, and childbirth.

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Extra info for 101 Questions about Reproduction: Or How 1 + 1 = 3 or 4 or More

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Imprinting. A fertilized egg contains pairs of genes—one from each parent—but in some pairs, one or the other is inactivated. ” It doesn’t work. This process of inactivating some genes and activating others is critical to development. Fertilized eggs do not develop without it. How many imprinted genes are at work in humans—and what they do—are much researched and debated. • 28 • 4. Cytoplasmic (or extrachromosomal) inheritance. Not all DNA is contained in the nucleus. Some lies in structures in the cytoplasm (the material outside the nucleus), especially the mitochondria.

They can produce thousands of exact duplicates of themselves in hours, with little pain or effort required. Sexual reproduction, by comparison, is a new invention. It is difficult, slow, and prone to error. Sperm and egg cells must be produced, each containing precisely half the genetic material in the nucleus of each parent cell. Opportunities for mutations (errors in copying DNA) crop up when reproductive cells form. Getting sperm and egg together introduces the complications of finding a mate and exchanging genetic material.

They look so much alike because they are genetically identical. Identicals are always the same sex. Fraternals may be the same or different sexes. ? What’s a Vanishing Twin? ” Its development stopped, and the material in it was absorbed. No one knows what causes a twin to vanish, but it may increase the chance of survival for the remaining embryo. Twins face greater risks of low birth weight and death in the first year of life than single babies do. How Common Are Multiple Births? Naturally occurring twin births run around 4 in 1,000 births.

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