article review chapter 1

DIZYGOTIC TWINS

I think this article is good for students to learn about detail of twins. Twins are two offspring resulting from the same pregnancy, either of the same or opposite sex. The students it also have know about types of twins. For example, dizygotic twins, like any other siblings, have an extremely small chance of having the exact same chromosome profile. Like any other siblings, DZ twins may look similar, particularly given that they are the same age. However, DZ twins may also look very different from each other. They may be different sexes or the same sex. The same holds true for brothers and sisters from the same parents, meaning that DZ twins are simply brothers and sisters who happen to have the same age. Studies show that there is a genetic basis for DZ twinning. However, it is only the female partner that has any influence on the chances of having DZ twins as the male cannot make her release more than one ovum. Dizygotic twinning ranges from six per thousand births in Japan (similar to the rate of monozygotic twins) to fourteen and more per thousand in some African countries. 1080917