This food web represents a community in a rain forest. boa constrictor
beetle-coati
poison dart frog
sloth
strangler fig fungus fruit bat
If people took most of the boa constrictors from this community, which
changes would be likely to occur? Select the three correct answers.
A. Sloths would increase.
B. Beetles would decrease.
C. Coatis would increase.
D. Poison dart frogs would decrease.
E. Strangler figs would decrease.

we solve the problem using the hardy-wineberg equation.

let us start with the homozygous recessive proportion of individuals with sickle cell anaemia,

we have the proportion as q² = 0.25.

∴ q = 0.5 (frequency of hbs in population)

further,

solving for the frequency of normal cell by using the fact that,

p + q = 1

∴ p = 1 - 0.5 = 1 - 0.5 = 0.5

now we can calculate 2pq in p² + 2pq + q², which is the frequency for heterozygous carriers of sickle cell anaemia,

∴ 2pq = 2 x 0.5 x 0.5 = 0.5

and the homozygous normal cell individuals proportion is given by the expression,

∴ p² = 0.5² = 0.25

hence, the carriers for sickle cell anaemia are in proportion, 0.5, or 50%.