What happens if a baby has 2 x chromosomes and a y chromosome?

Answer 1

In humans, it is the presence of the Y chromosome that makes an individual a male (not the ratio of X to Y). A normal male will have the sex chromosomes XY.

It is possible for males to have either an extra X chromosome, XXY, or an extra Y chromosome, XYY. These are both a type of aneuploidy - an unusual number of chromosomes.

XYY males are not very different from XY ("normal") males. They have normal testosterone levels, normal intelligence and normal fertility. They are on average taller than XY males.

XYY usually results from an error when sperm cells are formed, which results in a sperm cell that contains 2 Y chromosomes. This combines with the female gamete, which carries an X chromosome - resulting in an XYY individual.

Answer 2

Most often, the extra Y chromosome causes no unusual physical features or medical problems. Since XYY is not characterized by distinct physical features, the condition is usually detected only during genetic analysis for another reason.

47,XYY boys have an increased growth velocity during earliest childhood, with an average final height approximately 7 cm (3 in) above expected final height.

Testosterone levels (prenatally and postnatally) are normal in 47,XYY males. Most 47,XYY males have normal sexual development and usually have normal fertility.

Answer 3

If a male contributes a Y chromosome a female can only contribute an X chromosome (unless we go into medical uniquneness). This would result in making XY chromosome. XY chromosome would be a male.

Answer 4

It's impossible, because the female egg always has 1 X chromosome. But if somehow it did happen, you would die. You can't live without the x chromosome.

Answer 5

Yes, this does happen in nature however this is the cause of Down syndrome in humans.

Answer 6

it would be a girl

Answer 7

It is impossible.