2007-11-20 12:39:27 · 4 answers · asked by AMTRAK 2 in Science & Mathematics ➔ Biology
Most people have the gene for right-handedness which is dominant, the recessive allele for this give 50-50 chance for right-handedness or left-handedness. An identical twin who are homozygous recessive could end up with different dominant hand.
2007-11-20 13:18:10 · answer #1 · answered by naz 5 · 0⤊ 0⤋
Identical twins are genetically identical (genetic clones, essentially), but that does not make them identical people. The environment they have been exposed to since the embryo split will never be identical, leading to both epigenetic changes and environmental effects on development. So it's quite reasonable that identical twins would have different dominant hands, in the same way often one identical twin will develop a disease that does not arise in the other twin.
2007-11-20 13:11:07 · answer #2 · answered by mckingphd 2 · 1⤊ 0⤋
They are considered identical twins when ONE embryo splits early in the pregnancy and becomes TWO separate but geneticly identical babies. They will share the same sack and placenta.
2007-11-20 12:44:34 · answer #3 · answered by Barb Outhere 7 · 0⤊ 0⤋
Identical twins are when the zygote (fertilized egg) splits, but is initially one zygote. If it has always been two zygotes, they are fraternal. If they look the exact same, they are almost definately identical.
2007-11-20 12:49:46 · answer #4 · answered by Alejandro B 2 · 0⤊ 0⤋