Kaydon and Layton Wood are just five yet already they are local celebrities. In fact, the twins have been making headlines in regional newspapers since they were born – because one is white and the other black.
Kaydon 和Layton Wood仅仅只有五岁，但是他们已经是当地的名人了。实际上，这对双胞胎一出生就出现在在地区新闻头条，因为他们的一个是白皮肤，一个却是黑皮肤。
Each year, 12,000 sets of twins are born in Britain. Of these, 385 of them are black or mixed race, but those like Kaydon and Layton are rare.
英国每年有12000对双胞胎出生，其中385对是黑色或混血种族。但是像Kaydon 和Layton Wood这样的非常稀少.
Dr Jim Wilson, a population geneticist at the University of Edinburgh, explains: “Since parents contribute 50 per cent of the genes each to an offspring, the first generation born to a mixed-race couple will definitely be midway in colour between the two. But second-generation children are different. If one of the offspring marries a white person, it is possible for them to have a white child. It is not certain actually. One child in ten is now mixed race, which potentially means black and white twins will become far more common. ”
Dr Wilson continues: “There are about 20 genes [from a total of about 20,000] known to control skin and eye colour. In each gene you have a light-skinned variant and a dark- skinned variant. If you have more of the dark-skinned variant in your DNA, you’ll inherit dark skin. If there’s more light-skin variant, you’ll inherit light skin. Also, you can have African hair and very white skin, which is very striking because it’s so rare, or you could have a dark-skinned baby with blond hair r. It is also possible to have dark people with blue eyes.”
In the longer term, the rise of a mixed-racial gene pool could have some remarkable effects on our nation's health. Some diseases prominent within the European population that could see numbers drop as mixed-race grow are cystic fibrosis, coeliac disease, muscular dystrophy and haemophilia.