Compare monozygotic twins to dizygotic twins
What will be an ideal response?
A good answer would include the following key points:
• Monozygotic twins are twins who are genetically identical. This occurs when a cluster of cells in the ovum splits off within the first two weeks after fertilization. The results are two genetically identical zygotes that are called monozygotic, because they come from the same original zygote.
• Any differences in future development would be attributed only to environmental factors, because genetically they are exactly the same.
• Dizygotic twins are twins who are produced when two separate ova are fertilized by two separate sperm at roughly the same time. These types of twins are more common than monozygotic twins.
• Dizygotic twins are no more genetically similar than two siblings born at different times.
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