Question 1
For the following traits, the concordances of MZ and DZ twins are given as percentages. Which trait is unlikely to have a strong genetic influence?

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Question 2
How many distinct phenotypic categories should be observed for a polygenic trait in humans that results from segregation of additive alleles for 10 genes?
◦ 21
◦ 20
◦ 10
◦ 5
◦ 4