Posts Tagged ‘Medical Textbook’

“Genetically, the zygote is complete. It represents a new single-celled individual.” 129 129 Thibodeau, G.A. & Anthony, C.P., Structure and Function of the Body, 8th edition, St. Louis: Times Mirror/Mosby College Publishers, St. Louis, 1988, 410.

“The zygote therefore contains a new arrangement of genes on the chromosomes never before duplicated in any other individual. The offspring destined to develop from the fertilized ovum will have a genetic constitution different from anyone else in the world.” 128 128 DeCoursey, R.M., The Human Organism, 4th edition McGraw Hill Inc., Toronto, 1974, 584.

“It should always be remembered that many organs are still not completely developed by full term and birth should be regarded only as an incident in the whole developmental process..” 125 125 Beck, F., Human Embryology, Blackwell Scientific Publications, 1985, vi-vii.

“In that fraction of a second when the chromosomes form pairs, the sex of the new child will be determined, hereditary characteristics received from each parent will be set, and a new life will have begun.” 124 124 Kaluger, G. & Kaluger, M., Human Development: The Span of Life, The C.V. Mosby Co., St. Louis,…

“Human development is a continuous process that begins when an oocyte (ovum) from a female is fertilized by a sperm (spermatozoon) from a male. Cell division, cell migration, programmed cell death, differentiation, growth, and cell rearrangement transform the fertilized oocyte, a highly specialized, totipotent cell, a zygote, into a multicellular human being.”58 58Moore, K.L., The…

“Human development begins at fertilization when a male gamete or sperm unites with a female gamete or oocyte to form a single cell, a zygote. This highly specialized, totipotent cell marks the beginning of each of us as a unique individual.”57 57Moore, K.L., The Developing Human: Clinically Oriented Embryology, 8th ed., Philadelphia: Saunders, 2007. p.…

“Zygote. This cell results from the union of an oocyte and a sperm during fertilization. A zygote or embryo is the beginning of a new human being.”3  3Moore, K.L., The Developing Human: Clinically Oriented Embryology, 8th ed., Philadelphia: Saunders, 2007. p. 2.

“[E]mbryo: An organism in the earliest stage of development; is a man, from the time of conception to the end of the second month in the uterus.”1 1Harper Collins Illustrated Medical Dictionary, New York: Harper Perennial, 1993, p. 146.

“Zygote. This cell, formed by the union of an oocyte and a sperm, is the beginning of a new human being.”4 4Moore, K.L. & Persaud, T.V.N., Before We Are Born: Essentials of Embryology and Birth Defects, 7th ed., Philadelphia: Saunders, 2008, p. 2.