alleryDifferences between identical twins mainly reflect:
Adifferences in their genes
Bdifferent blood groups
Cbirth order of the twins
Dexperiences only one twin has
Answer & Solution
Correct answer: D. experiences only one twin has
1. Identical twins share essentially 100% of their genes.
2. So most of the differences between them are due to experiences that one twin has but not the other.
3. That is why twins are valuable for studying environmental influence.
_Source: Wikipedia, "Twin study" (rev 1372647321), section "Lead section"_
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