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

Question

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

Quizplus · Accepted Answer

The probability that gene 2 is dominant is calculated by dividing the total number of individuals with a dominant gene 2 by the total sample size. Here, 12 individuals have both genes dominant, and 28 individuals have gene 1 recessive but gene 2 dominant, making 40 individuals in total with a dominant gene 2 out of 100 individuals. Therefore, the probability is 40/100 = 0.40.

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