Class 12 NEET Biology Principles of Inheritance and Variation Questions Part 1

There are two possibilities to a couple for their child, that is either son or daughter. Probability of having either sex is $\frac{1}{2}$. The probability for each child is independent of each other. Hence, the probability of four sons to a couple is $\left(\frac{1}{2}\right)^{n},$ where $n$ is the number of children. Probability of four sons $= \frac{1}{2} \times \frac{1}{2} \times \frac{1}{2} \times \frac{1}{2} = \frac{1}{16}$ Hence, the correct answer is option $C$.