when does DNA combine ?
Answers
Answer:
here your questions answered
Explanation:
Interesting question! The quick answer is that the children will not be the same. If you think about it, this scenario isn't really that different than the same man and woman having two kids of the same sex. So why don't sisters and brothers look exactly alike? And not only that, how come they can look so different? There are two specific events that contribute to everyone being so different. Let's see what they are. As you know, our DNA helps determine what we look like, how we act, what diseases we might get and a whole lot more. And ultimately what DNA we get is determined from the egg and sperm that combined to make us. So to understand why siblings are so different from each other, we need to figure out how sperm and eggs get their DNA. First off, as you probably know, all of our DNA is packaged and stored along with some proteins in our cells as chromosomes (click here to learn more about chromosomes). Most of our cells have 23 pairs of chromosomes for a total of 46. One set of 23 comes from mom and the other 23 from dad. The egg and sperm cells are an exception--they have only 23 chromosomes each. A sperm from the man combines with a woman's egg in her womb to make a zygote. The zygote ends up with a total of 46 chromosomes and can now grow into a baby. Sperm and eggs end up with the DNA they get through a process called meiosis. When cells normally make new copies of themselves, each of the new cells ends up with 46 chromosomes (at least for humans). However, in meiosis, each new cell ends up with 23. How are the 23 chosen? For each of the 23 pairs, one of the two goes into the sperm or the egg. The choice of which of the pair of each chromosomes is totally random. So if nothing else were involved what would be the chances of having exactly the same kids? As you'll see, not very likely at all. To figure this out, we need to look at statistics (sorry about that!). Let's name the twin sisters Sally and Jane. And their common partner, Bob. We're going to figure out the chances that Sally and Jane will make an egg with the
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