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If the baby gets two X chromosomes, it will develop into a female.
If the baby gets one X and one Y, it will develop into a male.
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It usually needs two individuals which are different sexes from the same species. A man's sperm contains either an X or a Y chromosome.
It works by combining genes from more than one source. When a sperm and ova combine to form a fertilised egg, the baby may get either of these chromosomes from its father.
This is not the same as sexual reproduction, but it results in a similar mixture of genetic traits.
In sexual reproduction the cells used for reproduction, called gametes, are either eggs or sperms. The mechanism of cell division only works when one sperm alone enters the egg.
For some species sex is not determined by inheritance, but instead by environmental factors experienced during development or later in life.Sex can be determined in different ways: Usually, sex is determined by an organism's genes.With genetic sex determination, most alleles or genes that influence sexual development are on the same chromosome. Because genetic sex determination is controlled by a pair of sex chromosomes (or by the presence or absence of one of the chromosomes), there are usually the same number of male and female offspring.Hd Sex has high definition quality sex video clips for you and we have so many free porn vids that you'd have a hard time trying to watch them all, in fact this wouldn't be possible.But what's possible is that you jerk off now while watching at your favorite porn, so what are you waiting for?!
There are occasional exceptions to this rule: the process of meiosis which makes the sex cells can go wrong.