Question 1
Twins are said to be concordant for a trait when
◦ both twins exhibit the trait.
◦ only identical twins exhibit the trait.
◦ only fraternal twins exhibit the trait.
◦ fraternal twins more often show the trait than identical twins.
◦ None of these is true.
Question 2
Which of the following is not a characteristic of continuous variation?
◦ Traits can be quantified by measurement.
◦ Only a single gene pair contributes to the phenotype.
◦ The effect of each additive allele is small.
◦ Phenotypes show wide variation in expression.
◦ All of these are characteristics of continuous variation.