The
test will show whether or not two men come
from the same paternal line.
It is designed
for comparing/identifying
male descendants of a common male ancestor.
The Y-chromosome DNA test is especially
helpful in determining how closely two
males may be related in a directly paternal
lineage.
The Y Chromosome Analysis is used
to measure
the likelihood
of paternally-linked
relationships
through different
generations with a great degree of accuracy.
The
cost of the
test includes
2 men.
Additional individuals
will be charged
at the additional
person rate
specified.
The Y Chromosome
test gives
an accuracy
of 99.999% for inclusions & 100%
for exclusions.
Available
as a Peace
of Mind test only
Results available
within 5-7
days of samples
reaching our laboratories.
Express Services
Available -
click here
How
does Y Chromosome
Analysis work?
A
chromosome
is basically DNA that is coiled up very
tightly.
The X and Y chromosomes determine
the sex of
an individual. Women have two X chromosomes
and men have one X and one Y.
At conception
a female child
randomly receives a copy of either of her
mothers X chromosomes and she also receives
a copy the X chromsome belonging to her
father.
A male child again randomly receives
a copy either
of his mothers X chromosome but this time
receives a copy of the
Y chromosome
from the biological father.
The Y chromosome
is passed on
intact to male offspring and there is always
only ONE Y chromosome to choose from
(unlike the
X chromosomes). This means
that the Y
chromosome
passed on by a biological father to his
son, is exactly the same (except for random
mutation) as the Y chromosome he received
from his father,
who inturn received it from his father
and so on and so on.
In addition, the Y
chromosome
of biological brothers, uncles and male
cousins will also be identical.
The test
analyses 11
genetic locations. Biologically related
individuals should match BOTH alleles
at all locations.
This is different to the previous
tests e.g.
Paternity, which looks
for a match
of ONE allele at each location
to the father
and the a match of the second
allele to the
mother.
(When using non – sex
chromosomes
like those
analysed in
the other DNA
tests performed,
you would only
expect to see
both alleles match at all locations when
looking at samples from identical twins.)
When should the test be used?
When all
participants
in a test are
Male, this test may provide more information
that the Sibling or Grand –parentage
analysis – especially if there is
a low participant
number.
Case
1: Two men
who believe
they may be
half or full
Siblings/brothers.
Case
2: Grand – parent analysis, where
a male child
wants to test
his PATERNAL
grandparents
(i.e. the parents
of his biological
father) This
test would
then compare the child’s
Y chromosome
with the Y
chromosome
of his potential
grandfather.
What does the
test show?
The test will
show whether
or not two men come from the same paternal
line.
What does the test NOT show?
It will
not give a
conclusion
on the nature of that Paternal relationship.
Case 1: In case 1 above, a positive
result will
demonstrate
that the two men have a
common paternal
line, but it will not conclude that this
is their biological father or that they
are full or half Siblings. It will be for
the Client to decide what the result means
to them in the circumstances surrounding
the test. However,
if two men believe their only possible
biological link to be
their father,
then this gives
an excellent indication/level
of evidence,
that they have been fathered by the same
person.
A negative result would demonstrate
that they do
not have a common paternal
line and therefore
can not have
the same biological father.
Case 2: In
case 2 above,
a positive result will demonstrate that
the two men have a common paternal line,
but it will not conclude that they are
grandfather and grandchild. It will be
for the Client to decide what the result
means to them
in the circumstances surrounding the test.
However, if two men believe their only
possible biological
link to be
grandfather
and grandchild, then this gives
an excellent
indication/level
of evidence,
that they are related in this way and that
the grandfathers son is the biological
father of the grandson.
A
negative result
would demonstrate
that they do
not have a common paternal line and therefore
can not be paternally
related.
When
the test should
not be used?
If women are involved in the
test e.g. Sibling
test for a potential brother and sister.
Women do not possess Y chromosomes!
If all the
participants
are male but there is the possibility of
another paternal link
e.g. if the
man being tested could either
be a grand
parent or second uncle to the child in
question. This would occur if the potential
fathers in a case were cousins!
Example
of a result/conclusion
statement for
Y Chromosome
Analysis.
STATEMENT
Y Chromosome
analysis of
BLANK and BLANK
supports the
hypothesis that BLANK and BLANK share a
common paternal ancestor within a genealogically
reasonable number of generations.
Y chromosome
analysis of
the individuals
identified two distinct
lineages. A
comparison
of the two haplotypes reveals that the
individuals match all alleles identified. |
