The following diagram models a population of glowworms in an isolated cave - HSC - SSCE Biology - Question 18 - 2020 - Paper 1
Question 18
The following diagram models a population of glowworms in an isolated cave. The letters B and b represent the alleles for a gene in an individual.
Which row of the ... show full transcript
Worked Solution & Example Answer:The following diagram models a population of glowworms in an isolated cave - HSC - SSCE Biology - Question 18 - 2020 - Paper 1
Step 1
A. Gene flow
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Answer
Gene flow refers to the movement of alleles between populations. However, this option incorrectly links gene flow to a mutation, which is not accurate.
Step 2
B. Genetic drift
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Answer
Genetic drift involves random changes in allele frequencies, typically in small populations. This option incorrectly attributes frequency change to random events.
Step 3
C. Gene flow
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Answer
This option correctly identifies that the introduction of new members can increase the frequency of certain alleles in a population. This is an accurate application of gene flow.
Step 4
D. Genetic drift
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Answer
This is incorrect since genetic drift does not imply that an allele has become more advantageous; it is purely random, not based on fitness advantages.
