A Poll of 120 Ithacans Found That 30 Had Visited

question 759

Multiple Choice

A poll of 120 Ithacans found that 30 had visited the Museum of the Earth, and that 80 had been to
Home Depot. If it appeared that going to Home Depot and going to the Museum of the Earth were
Independent events, how many of those polled had been to both?

• A) 15
• B) It cannot be determined.
• C) 24
• D) 10
• E) 20

---

Definitions:

Pleiotropy

A genetic phenomenon in which a single gene influences multiple phenotypic traits in an organism.

Polygenic Inheritance

A type of genetic inheritance where multiple genes determine a trait, resulting in a continuous range of possibilities.

Incomplete Dominance

Incomplete dominance is a genetic situation in which neither allele is dominant, resulting in an offspring with a phenotype that is a blend of the parental traits.

Codominance

A genetic scenario where two alleles are both expressed equally in the phenotype of the heterozygote, instead of one being dominant over the other.