Question

According to Nature vs. Nurture studies, arrange the I.Q. of twins and siblings in order of high to low correlation:
(A) Identical twins reared in different environments
(B) Fraternal twins reared together
(C) Identical twins reared together
(D) Siblings reared apart
(E) Siblings reared together
Choose the correct answer from the options given below:

• A. (C), (A), (B), (E), (D)
• B. (A), (B), (C), (E), (D)
• C. (B), (C), (D), (E), (A)
• D. (C), (E), (D), (B), (A)

Answer 1

The Correct Option is A

In the Nature vs. Nurture debate, the study of twins and siblings offers insights into the genetic and environmental influences on I.Q. The order of I.Q. correlation from high to low for different groups is traditionally understood as follows: 

1. Identical twins reared together (C): The highest correlation, as they share 100% of their genes and similar environmental conditions, leading to the most similar I.Q.
2. Identical twins reared in different environments (A): Although separated, they still share 100% of their genes, resulting in a high correlation, albeit slightly lower than when reared together.
3. Fraternal twins reared together (B): They share about 50% of their genes but grow up in identical environments, leading to a significant correlation, though not as high as identical twins.
4. Siblings reared together (E): Like fraternal twins, they share about 50% of their genes and environment, but their correlation tends to be lower due to greater age differences and varied childhood experiences.
5. Siblings reared apart (D): They share the same percentage of genes as siblings reared together, but different environments lead to the lowest correlation among the groups.

This understanding aligns with the correct answer: (C), (A), (B), (E), (D).

Answer 2

The correlation of I.Q. among different groups based on the nature vs. nurture debate is typically observed as follows:

Identical twins reared together (C): Have the highest correlation in I.Q., as they share both genetics and environment, making their environments and genetic makeup similar.

Identical twins reared apart (A): Still show a high correlation due to genetic similarity, but slightly lower than when reared together, as the environmental factors differ.

Fraternal twins reared together (B): Have lower I.Q. correlation compared to identical twins, as they share only about 50% of their genes, while being raised in the same environment.

Siblings reared together (E): Show some correlation but less than fraternal twins, as age differences might play a role and they share a lower genetic similarity compared to twins.

Siblings reared apart (D): Have the lowest correlation since they share genetics but have different environments, leading to more varied influences on their I.Q.

This hierarchy reflects the influence of both genetics (nature) and environment (nurture) on intelligence.