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Unformatted text preview: pairs is given below. decibels hours/day identical twins 0.7 0.1 nonidentical twins 0.8 0.9 identical twins raised separately 4 0.5 adopted sibling pairs 0.9 2.3 Which trait is more heritable and why? #hours per day. Adopted siblings talk very different amounts per day, showing a genetic basis, and identical twins are far more similar than nonidentical. Identical twins raised separately talk at very different volumes, showing an environmental basis. Also difference in volume is very similar for identical twins, nonidentical twins, and adopted siblings. 4. Color-blindness is an X-linked recessive trait. A color-blind woman marries a man with normal vision. What phenotypes do we expect to see in their sons and daughters? Sons will all be color-blind, but no daughters will be colorblind....
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- Fall '07