Three-spined stickleback fish (gasterosteus aculeatus) show substantial heritable variation in gill-raker length related to differences in their diets. longer gill rakers appear to function better for capturing open-water prey, while shorter gill rakers function better for capturing shallow-water prey. which of the following types of selection is most likely to be found in a large lake (open water in the middle and shallow water around the sides) with a high density of these fish?
a) directional selection
b) stabilizing selection
c) disruptive selection
d) sexual selection

disruptive selection

Explanation:

Disruptive selection -

It is also known as the diversifying selection ,  it enables to describe the changes in the genetics of the population , in which the trait that is favored is the extreme over the intermediate values .

In case of disruptive selection , the trait variance increases and the population is distributed into two groups .

And , in this case the more individual acquire the peripheral character value in the both ends of distribution curve .

Hence , from the information of the question , the correct answer is disruptive selection .

Step-by-step explanation:

We would use the t- distribution.

From the information given,

Mean, μ = 2950

Standard deviation, σ = 115

number of sample, n = 25

Degree of freedom, (df) = 25 - 1 = 24

Alpha level,α = (1 - confidence level)/2

α = (1 - 0.98)/2 = 0.01

We will look at the t distribution table for values corresponding to (df) = 24 and α = 0.01

The corresponding z score is 2.492

We will apply the formula

Confidence interval

= mean ± z ×standard deviation/√n

It becomes

2950 ± 2.492 × 115/√25

= 2950 ± 2.492 × 23

= 2950 ± 57.316

The lower end of the confidence interval is 2950 - 57.316 =2892.68

The upper end of the confidence interval is 2950 + 57.316 = 3007.32

The solution is correct.