In theory, this corresponds with the surname, and can also be used to indicate deep (paternal) ancestry. all the way back, the Y chromosome can track the direct paternal lineage. A female gets one X from each.īecause a male’s Y is inherited only from his father, who got it from his father etc. A male inherits a Y chromosome from the father and its paired X from the mother. One pair of chromosomes has a specialised function – the determination of sex. That’s why siblings are not identical unless they grow from the same fertilized egg (identical or monozygotic twins). The cells for inside the cheek scrape off easily, so these tend to be used for testing.Įach of us has inherited one of each pair of chromosomes from our father, one from our mother, and these get recombined (they swap pieces with each other) inside us. This means that almost any cell type from an individual can be used for testing.
All cells types in any species have the same DNA, but different parts of it are expressed in, say, skin, muscle, brain, liver etc. Most cells in the body have a nucleus, which contains 23 pairs of chromosomes – long strands of DNA (deoxyribo nucleic acid) wound up with specialised proteins.
#MY FAMILY TREE BY TWO JURA HOW TO#
It is necessary to understand the various tests, and how to interpret them.
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