By Michael Le Page. In some countries, more than boys are born for every girls. The finding that some chemicals slow down sperm that carry the X chromosome could lead to gels for home use that make a couple less likely to conceive a girl, scientists have warned. You could start to do it in your bedroom. Nobody would be able to stop you from doing it. It was thought that the sperm of mammals that lead to male and female offspring are identical except for the DNA they carry. The team has found that chemicals that bind to two of these proteins can slow down the movement of X-carrying sperm without affecting the Y-carrying ones. This discovery makes it simple to separate sperm according to the sex of the offspring they could produce. When the researchers used this method on mouse sperm, they found that selecting the fastest swimmers for conception led to 90 per cent of the resulting pups being male. When they used slowed-down sperm, the pups were 81 per cent female.
Site Navigation
Covid-19 news: UK panel advises booster vaccine for 40 to 49-year-olds
Puberty is the time in which a child's sexual and physical characteristics mature because of changes in their hormones. It is generally considered to be the years from ages 12 to The exact age a child enters puberty depends on a number of different factors, such as genes, nutrition and gender.
More on this topic for:
A new study by scientists at the University of Cambridge claims teenage sperm is genetically weak, but is the claim credible? Does the problem of having genetically weak adolescent sperm really need to be added to this list? Scientists at the University of Cambridge have suggested this is the case after carrying out a study involving more than 24, parents and their children. The analysis focused on tiny genetic differences between parents and offspring, which are assumed to be caused by copying errors in the egg or sperm cells. The study shows that, on average, fathers pass on at least six times as many of these mutations to their children as mothers. The researchers say this could explain why children of teenage fathers have a higher risk for disorders such as autism, schizophrenia and spina bifida.
Any time a girl has vaginal sex with a guy, she is at risk for becoming pregnant. It doesn't matter how or where a couple has sex — whether they're standing up, the girl's on top, or they're in a pool or hot tub, or any other way — a girl can get pregnant. Sperm can swim up against gravity, and they're fast. As soon as sperm make it inside the vagina, they start racing toward the girl's egg. Sometimes if a girl is standing up or on top, it might seem like all of a guy's ejaculate comes out of her vagina. But enough sperm can still get in to make her pregnant. Even if a guy pulls out before he comes, a girl can still get pregnant because it's possible for some sperm to escape into the vagina before a guy ejaculates. It's also possible to get a sexually transmitted disease STD anytime you have sex vaginal, anal, or oral , in any position. Condoms can help prevent pregnancy and STDs, so use them for any type of sex, in any position. Reviewed by: Robyn R.
