You Won’t Believe This Girls Are Twin Sisters
Lucy and Maria Aylmer are about as close as two twin sisters can get, but you’d never guess it just from looking at them.
Although the very word “twins” calls up visions of perfectly matched babies, the truth is that fraternal, or non-identical, twins are far more common than their identical counterparts. The best example could be mixed-race twins who happen to have different skin color and other racial characteristics. Like these girls – Lucy has fair skin and straight red hair while her sister has dark, curly hair and dark skin.
From a biological point of view, the differences in these fraternal or dizygotic twins from two biracial parents are not surprising. In humans, a relatively small number of genes are thought to be responsible for human skin color. Different alleles or gene variants code for differences in the melanin found within the skin. Within some groups are high frequencies of dark skin alleles, while others have high frequencies of light skin alleles, for example. The parents of such twins, who are typically both of mixed race, have a combination of alleles for light and dark skin in their genome.
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