How are fraternal twins different from identical twins?
a) Fraternal twins develop from one egg; identical twins develop from two eggs.
b) Fraternal twins are monozygotic; identical twins are dizygotic.
c) Fraternal twins have all the same genes; identical twins do not have all the same genes.
d) Differences between identical twins are due to the environment; differences between fraternal twins may be due to either environment or genes.
Answer: d) Differences between identical twins are due to the environment; differences between fraternal twins may be due to either environment or genes.
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