4) A study published in 1937 examined the average differences between pairs of t

Question

4) A study published in 1937 examined the average differences between pairs of twins (either monozygotic (MZ) or dizygotic (DZ)) and pairs of siblings for three traits: height, weight, and score on an IQ test. Some of the MZ twins were raised together in the same household (RT) while other MZ twins were raised apart in different households (RA). The results of the study in terms of the average differences for each trait were as shown in the table below. MZ/RT MZ/RA DZ Siblings Height17 cm 1.8cm Weight 186 kg 4.49 kg4.54 kg 4.72 kg lQscore 5.9 4.4 cm 4.5 cm 8.2 9.9 9.8 (a) Which of these three traits (height, weight, or IQ score) appears to be influenced the most strongly by genetics, rather than by the environment? (b) Which of these three traits (height, weight, or IQ score) appear to be influenced the most strongly by the environment, rather than by genetics?

Explanation / Answer

And a) Height is the trait which is genetics and does not have to do with environment. It is not influenced by the environment. The genetic inheritance and the type of the gene present in the twins is responsible for deciding the height.

Ans b) Weight is something that is dependent on the environment. The weight of the twins many vary depending on the kind of the environment that is used for keeping the twins.

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