Consider the situation where two eggs are fertilized by two different sperm in one womb at the same time.These offspring are called ________ twins and share about ________ of their genetic material in common,just like siblings born at different times.

Question

Quizplus · Accepted Answer

The situation described is that of dizygotic (fraternal) twins, which are the result of the fertilization of two different eggs by two different sperm. As such, they share about half of their genetic material, just like siblings born at different times. Monozygotic (identical) twins would result from the fertilization of a single egg by a single sperm, which would then split into two embryos. In this case, the twins would share almost all their genetic material, around 99.9%. Choice A, monozygotic twins with only 50% of their genetic material in common, is not possible. Choice C, identical twins with 75% of their genetic material in common, is also not possible, since identical twins share nearly all their genetic material. Choice D, fraternal twins with 25% of their genetic material in common, is also incorrect, since fraternal twins share about half their genetic material, not a quarter.

Consider the Situation Where Two Eggs Are Fertilized by Two