On an island, the frequency of the allele A is p = 0.2…
Contributed by StemPy LabTry it on paper first. A hint, the key idea and the worked solution are here when you need them.
On an island, the frequency of the allele is . On the mainland, it is . In each generation, 10 per cent of the breeding adults on the island are migrants from the mainland. The mainland does not change.
- What is on the island after one generation?
- What is after two generations?
- What value does approach if the migration goes on for a very long time?
Need a reminder? The key ideaShow
Gene flow: . A founder group of individuals has gene copies, and a rare allele is missing with the chance . Drift in a small population is strong, and it wears away the heterozygosity by a factor in each generation.
The worked solution
Have you tried it?
Work it out on paper first. It is fine to get stuck or make a mistake: that is how we learn. When you are ready, go through the solution one step at a time, and check each step against your own.
Given. , , .
Plan. Apply again and again.
Step 1. (a) .
Step 2. (b) .
Step 3. (c) Each step moves one tenth of the way to the mainland value. In the long run approaches .
Answer: ; ; .
Check. The gap to falls from to to , a factor of each time.
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