In human population X, consider the simple Mendelian trait for freckles. F is th
ID: 194229 • Letter: I
Question
In human population X, consider the simple Mendelian trait for freckles. F is the dominant allele and f is the recessive allele. Individuals who are homdygous dominant (FF) or heterozygous (Ff) for the trait express freckles. Individuals who are homozygous recessive (ff) for the trait do not express feckles. In this population, 30% (03) of the alleles are recessive and 70% (0.7) are dominant (F). Use the Hardy-Weinberg equation to determine the genotype frequencies we should expect in the next generation. Show your work. P 0.7 0.41 % FF 2P": 2.07, 0.5-0.4L 4% H You have collected data based on the observed genotype frequencies of the next generation. They are: 60% FF, 30% Ff, 10% ff. Based on these observations and your expectations, is this trait currently evolving in this population? Why or why not? Population X lives on a small island with limited contact with the mainland and the total size of the population is 1000 individuals. The frequency of the F allele is much higher on the mainland. Describe what mechanism of evolution might be likely to occur in population X and why.Explanation / Answer
2. In the next generation,
60 % is FF
30 % is Ff
and 10% is ff. Ff contains equal amount of both F and f alleles. Hence 30 % Ff means 15 % F and 15 % f.
Total F % = 60 + 15 = 75 %, f % = 10 + 15 = 25 %. Previously it was 70 % F and 30 % f. Hence the trait is evolving. Evolution is always supported by natural selection. Nature selects the perfect one who can survive. Allele F is more suitable to the conditions and hence evolved to survive. At the same time f allele is not suitable hence it's frequency decreases.
3. The mechanism of evolution which is more likely to occur is Gene flow. Gene flow is a mechanism of evolution where an individual from one group or location migrates to other group or location. They might interbreed and get the genes of the other group to their original group. In this case, an individual of X population might go to mainland and interbreed. The offspring of this individual if joins X population will get the genes of mainland into the X population through breeding. If F allele is more suitable and is selected by nature, the frequency of F brought from mainland increases in X population.