To determine the value of [tex]\( q \)[/tex] given that [tex]\( p = 0.35 \)[/tex], we start by understanding the relationship between the two alleles. Since the sum of the probabilities of the two alleles must equal 1, we can write the equation:
[tex]\[ p + q = 1 \][/tex]
Given that [tex]\( p = 0.35 \)[/tex], we can substitute this value into the equation:
[tex]\[ 0.35 + q = 1 \][/tex]
Next, we solve for [tex]\( q \)[/tex] by isolating it on one side of the equation. We do this by subtracting [tex]\( 0.35 \)[/tex] from both sides:
[tex]\[ q = 1 - 0.35 \][/tex]
To find [tex]\( q \)[/tex]:
[tex]\[ q = 0.65 \][/tex]
So, the correct answer is:
A. 0.65
