Question

probability
brown is a dominant eye color in humans. if a father and mother each carry a gene for brown eyes (b) and a gene for blue eyes (b), what is the theoretical probability of their having a child with blue eyes?
a. 50%
b. 25%
c. 75%
d. 100%
guided practice
another example of theoretical probability and genes involves eye color. use the gene table to answer the following question.
(there is a gene table with gene from mother having columns b and b, and gene from father having rows b and b)

Explanation:

Step1: Completa la tabla de Punnett

$$\begin{array}{c|cc} & B & b \\ \hline B & BB & Bb \\ b & Bb & bb \\ \end{array}$$

Step2: Cuenta genotipos de ojos azules

Solo el genotipo $bb$ produce ojos azules; hay 1 caso.

Step3: Calcula la probabilidad

$\text{Probabilidad} = \frac{\text{Caso deseado}}{\text{Total de casos}} = \frac{1}{4} = 25\%$

Answer:

B. 25%