A Total of 1,500 Pairs of Adult Twins,600 Monozygotic and 900

question 4

Multiple Choice

A total of 1,500 pairs of adult twins,600 monozygotic and 900 dizygotic,were studied to estimate the concordance for a childhood cancer.In the 600 monozygotic twins,40 of the pairs were concordant for the disease,60 of the pairs were discordant for the disease,and neither twin had the disease in the remaining 500 pairs.In the 900 dizygotic twins,30 of the pairs were concordant for the disease,120 of the pairs were discordant for the disease,and neither twin had the disease in the remaining 750 pairs.What is the most reasonable conclusion to be drawn from these data?

• A) Genetic factors are unimportant in the etiology of childhood cancer.
• B) The data suggest a potentially important genetic component.
• C) The incidence of childhood cancer within monozygotic twins is higher than dizygotic twins.
• D) The prevalence of childhood cancer within dizygotic twins is higher than monozygotic twins.
• E) Environmental factors are the major determinants of child food cancer.

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Definitions:

Negative Real Number

A real number that is less than zero.

Standard Form

In mathematics, a way to write numbers using the digits 0-9, with each digit having a place value. In algebra, a standard form of an equation might be ax + by = c.

Greatest Common Monomial Factor

The greatest common monomial factor between two or more monomials is the highest monomial that divides each of the monomials without a remainder.

Polynomial

A polynomial is a mathematical expression involving a sum of powers in one or more variables multiplied by coefficients.