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By 1966, a more precise meaning of the word "conception" could be found in common-use dictionaries: the formation of a viable zygote. [23] In 1959, Dr. Bent Boving suggested that the word "conception" should be associated with the process of implantation instead of fertilization. [24]
Fertilization is the fusing of the gametes; a sperm cell and an ovum (egg cell) fuse to form a single-cell zygote.This is the beginning of the diploid phase of the human life cycle after two genetically unique haploid cells created via meiosis and chromosomal translocation combine their DNA and begin to develop into a multi-cellular organism.
The term "conception" refers variably to either fertilization or to formation of the conceptus after its implantation in the uterus, and this terminology is controversial. The zygote will develop into a male if the egg is fertilized by a sperm that carries a Y chromosome, or a female if the sperm carries an X chromosome. [5]
House Speaker Mike Johnson, R-La., who is still cosponsoring the Life At Conception Act, was asked Thursday on CBS whether he believes destroying or disposing of embryos is murder.
Advocates support legal prohibition or restriction on ethical, moral, or religious grounds, arguing that human life begins at conception and that the human zygote, embryo or fetus is a person and therefore has a right to life. The anti-abortion movement includes a variety of organizations, with no single centralized decision-making body. [1]
The view that all or almost all abortion should be illegal generally rests on the claims that (1) the existence and moral right to life of human beings (human organisms) begins at or near conception-fertilization; that (2) induced abortion is the deliberate and unjust killing of the embryo in violation of its right to life; and that (3) the law ...
Fertilization occurs when the sperm successfully enters the ovum's membrane. The chromosomes of the sperm are passed into the egg to form a unique genome. The egg becomes a zygote and the germinal stage of embryonic development begins. The germinal stage refers to the time from fertilization, through the development of the early embryo, up ...
Human embryology is the study of this development during the first eight weeks after fertilization. The normal period of gestation (pregnancy) is about nine months or 36 weeks. The germinal stage refers to the time from fertilization through the development of the early embryo until implantation is completed in the uterus.