[2]What will happen when the sun burns out in 5 million years ...
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15 answers - 11 Apr 2008
What will happen when the sun burns out in 5 million years! ... After more time, it will blow off it's outer layers, and shrink into white dwarf status.Male's Y chromosome may vanish in 5million years
MELBOURNE: The poorly designed Y chromosome,
which makes men, is degrading rapidly and will disappear, even if
humans are still around, an evolutionary geneticist has claimed. Jenny
Graves from Canberra University's institute for applied ecology, said
that the process is likely to happen within the next five million years
but could have begun in isolated groups, the Herald Sun reported.
Graves has been studying sex-determining genes in Australian animals so as to shed light on human genetics.
Y is always in the male and is active mostly in the testicles to make sperm. Graves asserted that is a "very dangerous" place as there is a lot of cell division going and with every split there is a chance for a mutation or gene loss. She said that the X chromosome is all alone in the male, but in the female it has a friend so it can swap bits and repair itself but if the Y gets a hit it's a downward spiral. Graves said that the X has about 1000 genes left, too many relating to sex and intelligence and the smaller Y started with about 1700 genes but only has 45 left, and that's mostly "junk".
She added that if humans don't become extinct, new sex-determining genes and chromosomes will evolve, maybe leading to the evolution of new hominid species.
Graves has been studying sex-determining genes in Australian animals so as to shed light on human genetics.
Y is always in the male and is active mostly in the testicles to make sperm. Graves asserted that is a "very dangerous" place as there is a lot of cell division going and with every split there is a chance for a mutation or gene loss. She said that the X chromosome is all alone in the male, but in the female it has a friend so it can swap bits and repair itself but if the Y gets a hit it's a downward spiral. Graves said that the X has about 1000 genes left, too many relating to sex and intelligence and the smaller Y started with about 1700 genes but only has 45 left, and that's mostly "junk".
She added that if humans don't become extinct, new sex-determining genes and chromosomes will evolve, maybe leading to the evolution of new hominid species.
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