EXERCISE 4 Gene Flow: Migration between Populations 1. Record th e number of eac

Question

EXERCISE 4 Gene Flow: Migration between Populations 1. Record th e number of each color of butterfly in Population 1 AND Population 2 in the following table. Population 1 ies Generation |#Pink #Blue Frequency°fpinkbutterm 2 4 Total N/A Population 2 Winkle Blue1 Frequency ofpink butterflies 137 eration 2 4 Total N/A 2. Calculate the frequency of the pink butterflies in each population. Do this in the tables above for all six generations in both populations. 3. Compare the "gene frequencies" for pink color between the two populations: were they the same at the beginning of the exercise? What are they like now? 4. What is the overall effect of gene flow on populations with different gene frequencies? 168

Explanation / Answer

2. Population 1

Population 2

3. Initially in the first generation the frequency of pink populations of butterfly were less in both populations 1 and 2. ( Lesser in population 1 than in 2 ). But by the sixth generation, the population frequency settled at about 0.45 or 0.5. It possibly means that pink is dominant over blue and due to the mixing of pink and blue species, heterozygous pinks are also created that led to the rise in numbers of the pink butterfly.

4. Gene flow is an important phenomenon in imparting genetic diversity among populations. The effect of emigration and immigration maintains genetic diversity in a population prevents demarcations between two or more independent populations which otherwise would have led to speciation. Populations with different gene frequences eventually equilibrate when they come in contact with members from the otehr species. This is only possibel if different populations live close by. If they are far off or cut out due to geographical issues, gene flow does not occur and inbreeding may result which would eventually lead to speciation.

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