A small island is home to a unique population of land snails. This population wa
ID: 180149 • Letter: A
Question
A small island is home to a unique population of land snails. This population was founded by 10 individuals that floated to the island on a log, and it has been isolated from the large mainland poulation ever since. The mainland population consistently had about 10,000 individuals in it through time. The siland population reached 1000 individulas after several generations, and then stayted at this size through time.
A team of researchers compared the genetic variation of the mainland and the isolated island populations for a few generations after colonization.Would biologist agree or dissagree with the following staments?
The Island population likley has fewer alleles-that is versions of genes-than the mainland population.
A-Agree B-Disagree
Genetic drift is more pronounced in the siland population than in the mainlan population in these first few generations
A-Agree B-Disagree
Some harmful traits may have become more common in the island population than in the mainlain poulation
A-agree- B- Disagree
Biologist observed genetic drift but not evolution
A-agree B-disagree
Explanation / Answer
The Island population likley has fewer alleles-that is versions of genes-than the mainland population.
agree
let us assume the genotypes AA, Aa and aa in the mainland population. the 10 individuals those who started the population in island may not comprise all three genotypes. if all the 10 individuals are of 'AA' genotype or all are 'aa' genotype, in this case, the population in island may comprise fewer alleles.
Genetic drift is more pronounced in the island population than in the mainland population in these first few generations
agree
the relative frequency of different genotypes in a small population may vary for any small effects.
Some harmful traits may have become more common in the island population than in the mainlain poulation
let us suppose the double recessive genotype 'aa' results in some autosomal recessive disorder. if most of the 10 individuals comprise 'aa' genotype, the chance of occurence of disease would increase.
Biologist observed genetic drift but not evolution
agree
here, the environmental conditions of the island are not mentioned. therefore, let us assume, the conditions are similar to that of mainland. if this is the case, there is no requirement of evolution, since the genes that favoured survival in mainland would favour growth even in island.
if the environmental conditions are different, then there would be a chance of evolution
Related Questions
drjack9650@gmail.com
Navigate
Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.