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What fact explains why half of the children born are male and half are female?
Wiki User
∙ 10y ago
Just think about flipping a coin... the chances of it landing on tails is 50% and the chances of it landing on heads is 50%. So unless the coined is tricked, than it should be exactly 50% for both heads and tails.
Wiki User
∙ 13y ago
Wiki User
∙ 10y agoIn humans, sex is determined by the two sex chromosomes inherited from mother and father. There are 'X' and 'Y' chromosomes. If a human has two X chromosomes (XX), they will be female; if they have at least one Y chromosome (XY), they will be male (or tend towards male).
In order to mix chromosomes, each human has to produce cells which contain only one sex chromosome, which can then be combined with another human's single-chromosomes cell to produce a new cell with a new combination. The process which generates these single-chromosome cells is called meiosis, and the single-chromosome cells produced are egg cells in females (oocytes) and sperm cells in males (spermatocytes).
During meiosis, the two sex chromosomes present are separated, each into a new egg or sperm cell. Because females only have two X chromsomes to split, all egg cells contain an X chromosome. Males however have both X and Y, meaning that sperm cells can contain an X or a Y chromosome.
The important detail here is that the splitting during meiosis is completely random. This means that roughly 50% of sperm cells will contain an X, and roughly 50% of sperm cells will contain a Y. It is also very important that whether a sperm cell contains a Y or an X does not affect its likeliness to reach and fertilise an egg cell.
These two details combined mean that each child has an approximately equal chance to be male or female.
When there are two options (Male and Female), and the chances for both are equal (50/50), the result is that half of the times it will be the one (Male) and half the times the other (Female).
This also holds true for flipping a coin. There are only 2 ways a coin can land, heads or tails. So, as long as the coin is not biased (double headed, or weighted) then there should be a 50% chance that the coin lands heads up and a 50% chance the coin lands tail up.
Therefore, in the long run, a coin will land heads up half the time, and tails up the other half.
Wiki User
∙ 15y ago1. Because there are two parents, one parent is a boy and the other is a girl. This gives you a 50 percent chance that you'll get a boy or a girl.
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