Neco Model Questions Vol1 2018 Biology Question 3

Practice objective / multiple choice question 3 from the 2018 Neco Model Questions Vol1 Biology examination.

Neco Model Questions Vol1 2018 Biology Objective / Multiple Choice Medium Difficulty
Question 3 NECO_MODEL_QUESTIONS_VOL1 • 2018 • BIOLOGY • objective

In a beetle population the frequency of allele \(A\) (green colour) is \(p=0.6\) and allele \(a\) (brown colour) is \(q=0.4\). The green phenotype (genotypes \(AA\) and \(Aa\)) has a 20 % survival advantage over the brown phenotype (\(aa\)). Assuming random mating and that selection acts only on survival, (i) calculate the allele frequencies after one generation of selection, and (ii) determine the change in heterozygosity \(H=2pq\) caused by this selection.

Answer Options

A. After selection \(p'≈0.590\), \(q'≈0.410\); heterozygosity falls from 0.480 to ≈0.466 (decrease ≈0.014).
Correct Answer B. After selection \(p'≈0.617\), \(q'≈0.383\); heterozygosity falls from 0.480 to ≈0.473 (decrease ≈0.007).
C. After selection \(p'≈0.600\), \(q'≈0.400\); heterozygosity unchanged at 0.480 (no change).
D. After selection \(p'≈0.650\), \(q'≈0.350\); heterozygosity rises to ≈0.455 (increase ≈0.025).
Correct Answer
B
Correct Option:
After selection \(p'≈0.617\), \(q'≈0.383\); heterozygosity falls from 0.480 to ≈0.473 (decrease ≈0.007).

About This Question

This is Neco Model Questions Vol1 2018 Biology Question 3. It is one of the objective questions from the 2018 Neco Model Questions Vol1 Biology examination.

Difficulty level: Medium .

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