H D4 TS Q08 – Selective High School

Marmosets are the only primates other than humans that prefer using one hand over the other. Considerably more marmosets are left-handed than right-handed. Researchers believe that since infant marmosets engage in behaviour that imitates their parents, this imitation is what infant marmosets apply to learn which hand to use, so infants raised by left-handed parents generally prefer using their left hands.

Which one of the following, if true, most supports the researchers’ hypothesis?

A study conducted on adult marmosets revealed that many were right-handed. According to the study, 33 per cent of marmosets are ambidextrous, meaning they can use either of their hands. Almost all right-handed marmosets have at least one sibling who is left-handed. Marmoset infants raised in captivity with right-handed adult marmosets to whom they are not related are more likely to be right-handed than left-handed.

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Which one of the following, if true, most supports the researchers’ hypothesis?