A Geneticist Is Studying Two Genes What Is the Probability That in a Randomly-Sampled Individual, Gene

question 63

Multiple Choice

A geneticist is studying two genes. Each gene can be either dominant or recessive. A sample of 100 individuals is categorized as follows.

$\begin{array} { c c c } & \text { Gene 2 } & \text { Gene 2 } \\\text { Dominant } & \text { Recessive } \\\text { Gene 1 Dominant } & 12 & 18 \\\text { Gene 1 Recessive } & 28 & 42\end{array}$

What is the probability that in a randomly-sampled individual, gene 2 is dominant?

• A) 0.70
• B) 0.12
• C) 0.40
• D) 0.60

---

Definitions:

Recessive Allele

An allele that is not expressed in the heterozygous state. Compare with dominant allele.

Hybrid

The offspring of two genetically dissimilar parents.

Loci

Positions or specific locations on a chromosome where genetic information is stored.

Chromosome

A long, thread-like structure composed of DNA and protein that carries genetic information in the nucleus of a cell.