How do identical twins start out genetically?
Q: How do identical twins start out genetically?
A: Identical twins start out as genetically identical with the same alleles.
Q: What is the meaning of MZ twins and DZ twins?
A: MZ twins mean monozygotic twins, and DZ twins mean dizygotic twins. MZ twins are formed from one fertilized egg, while DZ twins are formed from two separate eggs.
Q: Are identical twins always of the same sex?
A: Yes, identical twins are always of the same sex.
Q: How are fraternal twins formed?
A: Fraternal twins are formed by two separate eggs fertilised by two separate sperms.
Q: Is the birth environment the same for both kinds of twins?
A: Yes, both kinds of twins, identical and fraternal, are carried in the same uterus at the same time, so their birth environment is the same.
Q: Which type of twin is more common, monozygotic or dizygotic?
A: Dizygotic twins are more common than monozygotic twins.
Q: What is the frequency of monozygotic twinning, according to research?
A: According to research, the frequency of monozygotic twinning is one in 240 births.
