Googled bio-genesis textbook, Find no such text. Where is this from?
And all I have seen of anything biogenesis cane be summed up by this: The principle that life originates from only preexisting life and never from nonliving material.
So far the scientists are all have their own definitions. Most being life begins at 22 weeks. Where the embryo can exist if need be out of the womb. Some point at respiration, some at brain wave activity.
So there is NOT a clear definition.
Here are some references I found in an old email of mine -- my mother's old co-worker sent these awhile ago (both are OBGYN and pro-life advocates).
Keith L. Moore’s The Developing Human: Clinically Oriented Embryology (7th edition, Philadelphia, PA: Saunders, 2003):
"A zygote [fertilized egg] is the beginning of a new human being. Human development begins at fertilization, the process during which a male gamete … unites with a female gamete or oocyte … to form a single cell called a zygote. This highly specialized, totipotent cell marks the beginning of each of us as a unique individual."
From
Human Embryology & Teratology (Ronan R. O’Rahilly, Fabiola Muller [New York: Wiley-Liss, 1996], 5-55):
Fertilization is an important landmark because, under ordinary circumstances, a new, genetically distinct human organism is thereby formed."
From T.W. Sadler, Langman’s
Medical Embryology (10th edition, Philadelphia, PA: Lippincott Williams & Wilkins, 2006, p. 11):
"Development begins with fertilization, the process by which the male gamete, the sperm, and the femal gamete, the oocyte, unite to give rise to a zygote."
William J. Larsen,
Essentials of Human Embryology [New York: Churchill Livingstone, 1998, pp. 1, 14]: "Human embryos begin development following the fusion of definitive male and female gametes during fertilization[.] … This moment of zygote formation may be taken as the beginning or zero time point of embryonic development."
The word “embryo” is defined as such (Considine, Douglas [ed.],
Van Nostrand’s Scientific Encyclopedia, 5th edition, New York: Van Nostrand Reinhold Company, 1976, p. 943): "Embryo: The developing individual between the union of the germ cells and the completion of the organs which characterize its body when it becomes a separate organism. … At the moment the sperm cell of the human male meets the ovum of the female and the union results in a fertilized ovum (zygote), a new life has begun."
Dr. Jerome Lejeune (known as the Father of Modern Genetics) told lawmakers: "To accept the fact that after fertilization has taken place a new human has come into being is no longer a matter of taste or opinion … it is plain experimental evidence. Each individual has a very neat beginning, at conception."
The Supreme Court ruling
Roe v. Wade, made this official statement (not scientific, but despite their ruling...)
"To deny a truth [about when life begins] should not be made a basis for legalizing abortion."
There are the only ones I had in my email. But I'm interested in seeing the statements you found when you researched.
