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Identical Twins Have Nearly the Same Genes,whereas Fraternal Twins Do

Question 101

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Identical twins have nearly the same genes,whereas fraternal twins do not.In fact,around half of all fraternal twins are male and female siblings.Alternate terms for identical and fraternal twins are monozygotic and dizygotic.Why do you think these terms are used? Explain your answer in terms of what you know about fertilization.

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Identical twins occur when one embryo sp...

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