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  • ABO Blood Types can be used to calculate paternity?
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  • Eye colour can be used to determine paternity?
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  • Consent is required to test a person's DNA sample?
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  • DNA can be used to help solve crimes?
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DNA Diagnostics Centre Eye Colour Inheritance Chart

The DNA Diagnostics Centre  eye colour inheritance chart is based on a theory that dates back to the 1800's. It is not a reliable predictor of paternity.

DNA Diagnostics Centre provides the eye colour inheritance chart as an educational service for our guests. Visitors seeking a more accurate determination of paternity for personal or legal purposes are encouraged to order either a private DNA paternity test or a legal DNA paternity test.

The eye colour inheritance chart is used to determine either:

  1. The possible eye colours of the child when the eye colours of the mother and the father are known, or
  2. The possible eye colours of the father when the eye colours of the mother and child are known

Eye colour is known to have a polygenic inheritance pattern, possibly governed by 6 or more genes. There are also 6 different described eye colours. Basically, dark is dominant at each of the 6 genes, and the more dominant alleles that you have the darker your eyes are. The different eye colours and the number of dominant alleles suggested in this theory are shown below.

DNA Diagnostics Centre Eye Colour Inheritance Chart:

Light blue 0 dominant alleles
Blue 1 dominant allele
Blue-green 2 dominant alleles
Hazel 3 dominant alleles
Light brown 4 dominant alleles
Brown 5 dominant alleles
Dark brown / black 6 dominant alleles

Basically, based on this theory:

  • 2 light blue eyed parents cannot have a blue eyed (or darker eyed) child.
  • 2 blue eyed parents can have a blue-green (or lighter) eyed child, but not hazel or anything darker.
  • 2 blue-green eyed parents can have a light brown (or lighter) eyed child, but not brown or anything darker.
  • 1 light brown eyed parent and 1 'blue-green' eyed parent can have a child with any of the possible eye colours.
  • 2 dark brown or black eyed parents can have a child with any of the possible eye colours (but it is unlikely they will have a light eyed child, such as light blue or blue).

Lastly eye colour usually starts out much lighter at birth and becomes its true colour in 1 or 2 years after birth. Variations can also occur randomly.

Interestingly, this theory was generated in the late 1800s, which demonstrates

  • how inheritance patterns were pretty well understood (by some) back then, and,
  • that eye colour is, still today (even with the human genome sequenced), very difficult to predict due to its polygenic inheritance pattern.

In conclusion, eye colour is not a very reliable or accurate method of determining the paternity of a child.

For 100% accuracy in determining paternity, please order a free kit by clicking the button below. DNA Diagnostics Centre offers paternity testing for peace of mind as well as legal paternity testing.

 

 

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