25 Jun Human populations are known to isolate themselves from other groups
Question
2. Human populations are known to isolate themselves from other groups based on cultural identity, language religion, etc. Some of these communities in North America include the Ashkenazi (descendants of European Jewish communities, Yiddish speakers), the Cajun population of Louisiana, the Arcadian population of Canada, and the Old Order Amish community of Pennsylvania. One in every 27 members of the Ashkenazi community, the Cajun population of Louisiana, the Arcadian population of Canada, and the Old Order Amish community of Pennsylvania carry the recessive Tay Sachs gene (Tay Sachs disease is caused by a recessive mutation on chromosome 15, and children with Tay Sachs rarely live beyond age 5), but this recessive gene is only found in 1 out of every 250 people in the general North American population. Explain the high incidence of Tay Sachs among the Ashkenazi, Cajun, Arcadian, and Old Order Amish populations.
4. What five characteristics must a population have to never have a change in allele frequencies?
3. Would the bottleneck effect that removes 25% of individuals have a greater impact on a population of 25 birds or a population of 25,000 birds?
4. What five characteristics must a population have to never have a change in allele frequencies?
5. An island has a population of 100,000 moths that has 98% grey individuals and 2% black individuals. Generation after generation, this ratio and population size remains basically the same. After a hurricane, 10,000 black moths are blown onto the island. This is an example of Gene flow.
6. Red-cockaded woodpeckers live in mature open pine forest with little understory. One aspect of managing this endangered species is trying to connect isolated populations with corridors of appropriate habitat. Why is this important?
7. Two populations of frog are separated from each other by a large distance and rarely interbreed with each other. However, approximately one male frog a year makes the journey and breeds with females in the other population. Would you expect these populations to eventually become separate species? Why or why not
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