An offspring gets one set of chromosome from mom and other from dad. Now how can twins get there total chromosomal number if they are identical twins?
An offspring gets one set of chromosome from mom and other from dad. Now how can twins get there total chromosomal number if they are identical twins?
It is not as you think
here it is
It depends on whether they are fraternal or identical.
For identical twins, a single egg is fertilized by a sperm, the same way single babies are conceived. The zygote then splits in two, with identical copies of the genetic information it contained now in two separate zygotes that each continue to develop independently. That's why identical twins are identical; they have the same source code.
For fraternal twins, the mother produces two eggs instead of the usual one. Each egg is fertilized with a different sperm. Therefore, the resulting zygotes are just as different as any two siblings; it just happens that they develop simultaneously.
Since fraternal twin conception requires that the mother produce multiple eggs -- a trait that is inheritable -- fraternal twins can "run in the family," while (I don't think) identical twins typically do.
here it is
It depends on whether they are fraternal or identical.
For identical twins, a single egg is fertilized by a sperm, the same way single babies are conceived. The zygote then splits in two, with identical copies of the genetic information it contained now in two separate zygotes that each continue to develop independently. That's why identical twins are identical; they have the same source code.
For fraternal twins, the mother produces two eggs instead of the usual one. Each egg is fertilized with a different sperm. Therefore, the resulting zygotes are just as different as any two siblings; it just happens that they develop simultaneously.
Since fraternal twin conception requires that the mother produce multiple eggs -- a trait that is inheritable -- fraternal twins can "run in the family," while (I don't think) identical twins typically do.
