Marcia and Millie Biggs, both 11, from Highgate, Birmingham, looked almost identical when they were first born in July 2006, but their amazing differences soon became apparent.
As little Millie started to become darker-skinned, blue-eyed Marcia took on a lighter complexion, growing blonde, curly hair.
'It does get a bit irritating sometimes, when you have people stopping you in the street all the time, but then I remember how beautiful they are and how lucky I am to have them, and the irritation goes away.
'There were a few teachers who didn't believe them at first, but as they got to know them, they saw how similar they were.
'Other than the differences in skin tone, they look almost exactly the same.. They are both absolutely beautiful, and they make me proud everyday.
'They do absolutely everything together, and they're always making videos of themselves singing and dancing together.
'When they were younger, Millie was always quite shy, but as she's grown up she's become a real bossy-boots.
'She's very organised and in control, and is often telling Marcia what do.
'Millie is our little princess, she loves to have clothes related to princess and lots of dolls.
'She's obsessed with the colour pink as well, just like you'd expect from a little feminine girl. Marcia's a lot more of a tomboy.
'A school friend was very good at gymnastics, and she's picked it up from there and started to really enjoy doing that.
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.
'Because she's having extra gymnastics lessons, we wanted Millie to do something outside of school too, so she's going to do drama because she loves to perform.
'They're both very outgoing and positive, which is wonderful. They're great to be around, because they always make you simile.
'I've devoted my who life to looking after them, and I've treasured seeing them grow up together.
'They are both really excited to be moving up to secondary school, because they love to learn.
'Millie is very good at maths, and Marcia has a talent for English, so it's good that they have that bit of competition together.
'Millie has become a little bit darker, and her hair is curlier and tighter, whereas Marcia's hair is more of a golden brown.
'I've explained to the school that despite their differences, they are twins, and hopefully that will help to overcome any awkwardness.
'But people are going to be amazed by them for the rest of their lives, and I think that's fantastic.'
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