The genetic similarity of identical twins isMultiple Choice100%.50%.75%.somewhere between 50% and 100%.

On average, how much of their total DNA is the same in two people selected at random?Less than 50%75%90%More than 99%

Fill in the Blank QuestionFill in the blank question.Twin-adoption studies examine three different forms of similarity: genetic, environmental, and .

Research suggests that identical twins have many similarities, such as body weights, even as adults. A sample of ten sets of identical twins were weighed and had their weights recorded in kilograms. The researcher wishes to test whether there is a statistically significant difference in adult weight between first-born and second-born identical twins.Source: M. J. Tramo, W. C. Lodtus, T. A. Stukel, R. L. Green, J. B. Weaver, and M. S. Gazzaniga. “Brain Size, Head Size, and Intelligence Quotient in Monozygotic Twins.” Neurology 50, 1246–52.Given the design of the study and the question of interest, which one of the following computer outputs is relevant to use?

Similar intelligence test scores for identical twins reared apart are taken as evidence for the:

Identical twins were separated at birth and brought together after 13 years. They varied in height by 5 centimeters and in weight by 10 kilograms. The most probable explanation for these differences is that (1) their environments affected the expression of their traits (2) their cells did not divide by mitotic cell division (3) they developed from two different zygotes (4) they differed in their genotypes