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| [Conception] | the fusion of the egg and sperm to create an embryo.
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| [Chromosome] | thread-like structures found in the nucleus of all cells (except red blood cells), which contain our genetic material (dna). chromosomes come in pairs, and a normal human cell contains 46 chromosomes, 22 pairs of autosomes and two sex chromosomes.
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| [Chromosomal mosaicism] | the presenceof two or more cell lines which differ from each other in chromosome number or structure, in an individual that has developed from a single fertilized egg.
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| [Chromatid] | exists in a pair as part of two sister chromatids; each of which contains an identical copy of its original chromosome. each chromosome duplicates itself making a pair of sister chromatids during the s phase (s stands for dna synthesis) of the mitotic cell cycle. these sister chromatids eventually separate and create two daughter cells identical to the first.
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| [Chorionic villus sampling (CVS)] | a prenatal diagnosis procedure performed at 10 to 12 weeks gestation which involves obtaining a sample of the placenta.the cells in the placenta generally represent the cells of the baby, and can be examined to look for chromosomal, biochemical or gene alterations in the baby.
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| [Chorionic villi] | the tissue that attach the pregnancy to the wall of the uterus. the cells of the chorionic villi are sampled during chorionic villus sampling.
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| [Chorion] | the outermost protective membrane around the fetus. the cells of the chorion are sampled during chorionic villus sampling.
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| [Centromere] | the part of a chromosome which separates the two arms. the short arm is called the 'p' arm; the long arm is called the 'q' arm.
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| [Cell] | the basic subunit of any living thing.
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| [Cell division] | the process by which cells multiply during the growth of tissues or organs. the type of cell division involved in the growth of the body is called mitosis. the cell division which produces the reproductive cells is called meiosis.
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