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| [Gene markers] | landmarks for a specific gene, either detectable traits that are inherited along with the gene, or distinctive segments of dna.
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| [Gene] | a working subunit of dna that codes for the synthesis of a specific protein. genes are located on the chromosomes. each gene has one or more specific effects on the phenotype, and can mutate to various allelic forms.
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| [Gametes] | reproductivecells which each contain 23 chromosomes; sperm in males and eggs in females
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| [Fibroblasts] | the type of cell that make up skin.
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| [Fetus] | term used to describe a developing baby from the nineth week of development to birth.
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| [Fetal blood sampling] | a prenataldiagnosis procedure used to obtain a blood sample from the baby. the blood sample can be examined to look for chromosomal, biochemical or gene alterations in the baby.
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| [Fertilized egg] | an egg, or oocyte, becomes fertilized once its genetic complement has fused with that of the sperm which has entered it. a fertilized egg contains 23 chromosomes from the mother, and 23 chromosomes from the father, that came in the sperm. once fertilized, an egg is known as a zygote.
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| [Fertilization] | the fusionof the egg and sperm at conception to create an embryo.
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| [Extra-embryonic tissue] | the tissues that develop from the fertilized egg that do not involve the actual fetus; ie: the placenta and the membranes
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| [Embryonic progenitor cells] | the 1-5 cells of the blastocyst that are destined to develop into the baby
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