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A mother who gave birth to one black and one albino twin has revealed her shock at first seeing them - and initially believed she had been brought the wrong baby.
Judith Nwokocha, 38, a Nigerian-born photographer from Calgary, was astonished when she first met her baby boy, Kamsi, who was black, and her little girl Kachi, who was later diagnosed with albinism.
She and her husband, who is also black, struggled for eight years before falling pregnant through IVF, and now find that people don't believe the twins, now three, are theirs because of their different skin colours.
Yet the siblings 'haven't noticed anything different', the doting parent claimed, and have a 'great' relationship.
Oculocutaneous albinism is a condition that affects an estimated one in 20,000 people worldwide from birth.
It is the most common type of the two forms of albinism and affects the skin, hair and eyes.
It is an inherited condition and if both parents carry the faulty gene, then there is a one in four chance that their child will be born with the condition.
Individuals with albinism typically have very fair skin and white or light blonde hair.
It also reduces the pigmentation of the coloured part of the eye - the iris - and the light sensitive tissue at the back of the eye - the retina.
People from ethnic groups with darker pigmentation tend to have darker coloured eyes.
Those with the condition usually have vision problems such as reduced sharpness, increased sensitivity to light (photophobia) and involuntary eye movements (nystagmus).
Because the twins are non-identical, this is explains why only one inherited the faulty gene from their parents.
In a 2010 article in the Journal of Perinatology, researchers from the University Medical Centre Utrecht, described the case of twin girls being born to parents of Congolese origin, where one was black and one was albino.
They ruled out heteropaternity as a cause - where there are two different fathers - and concluded through testing that one child was albino.
In 2017, an exhibition of work by Brazilian photographer Davy Alexandrisky in Moambique featured a photo of sisters, born to a black father and mother in 1995 where one was albino.
Adorable Kamsi (right), and Kachi from Calgary, Canada, when they were first born
Kachi (pictured with her brother) was diagnosed with Oculocutaneous Albinism (OCA) type 2 - an inherited condition where people do not produce sufficient melanin and this affects their eyes, skin and hair
Apart from sensitive skin and eyesight, Kachi (pictured with her brother) is perfectly healthy, according to her mother
'I was shocked,' Judith said of the moment she held Kamsi for the first time. 'I thought they had handed me somebody else's baby, I didn't believe she was mine.
'It never crossed my mind I was going to have an albino baby, we don't have any in my family, nor my husband's family.
'It was a real shock for me, I was thinking, "What are they doing, why did they give me someone else's baby?"
'And then I thought, "Could it be I got somebody else's?" But I was just glad she was perfect. Both were healthy.
Judith added: 'Other than the fact that she is different colour, she looks exactly like me.'
Because of her weight, Kachi had to stay in the ICU for several days, and it was then that doctors explained to Judith that her daughter had albinism.
The odds against of a mixed race couple having twins of dramatically different colour are a million to one.
Skin colour is believed to be determined by up to seven different genes working together.
If a woman is of mixed race, her eggs will usually contain a mixture of genes coding for both black and white skin.
Similarly, a man of mixed race will have a variety of different genes in his sperm. When these eggs and sperm come together, they will create a baby of mixed race.
But, very occasionally, the egg or sperm might contain genes coding for one skin colour. If both the egg and sperm contain all white genes, the baby will be white. And if both contain just the versions necessary for black skin, the baby will be black.
For a mixed-race couple, the odds of either of these scenarios is around 100 to one. But both scenarios can occur at the same time if the woman conceives non-identical twins, another 100 to one chance.
This involves two eggs being fertilised by two sperm at the same time, which also has odds of around 100 to one.
If a sperm containing all-white genes fuses with a similar egg and a sperm coding for purely black skin fuses with a similar egg, two babies of dramatically different colours will be born.
The odds of this happening are 100 x 100 x 100 - a million to one.
Proof white people came from Black people.
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