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Anonymous Ayman Rashidi
wrote...
2 months ago
You are studying an extremely large population of unicorns found on a remote island. You observe variation in both the amount of sparkles each unicorn has on their coats, as well as the length of their tails. You found that unicorns with more sparkly coats have greater success at finding mates and reproducing, but that the length of their tail does not seem to affect survival or reproduction. After some intense work in your lab, you determine that gene Glitter Enhancing Protein-7 (Gep7) is responsible for the amount of sparkles, while gene Unicorn Fibroblast Growth Protein (Ufgp) is responsible for tail length.

Of these two genes (Gep7 and Ufgp), which one is more likely to be in Hardy-Weinberg equilibrium and why? You must address why the one gene is more likely to be in HWE and why the other gene is less likely to be in HWE. Given that the population is extremely large and that the island is remote, you can rule out any impacts of genetic drift and gene flow

Source  Biological Science, Third Canadian Edition (3rd Edition)
By: Scott Freeman
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habibahabiba
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2 months ago
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If we look at the genes of the unicorns on the remote island, gene Glitter Enhancing Protein-7 (Gep7) which is responsible for the amount of sparkles and gene Unicorn Fibroblast Growth Protein (Ufgp) which is responsible for tail length. It is more likely that Gep7 is not on a Hardy-Weinberg equilibrium while Ugfp is more likely to be on one.

Hardy-Weinberg equilibrium states that in a population that is not evolving, its genotype and allele frequencies remain constant as long as they are undergoing Mendelian segregation and allele recombination. Thus HEW simply means that the population has achieved Genetic Equilibrium where the gene pool remains constant. There are several conditions to achieve this equilibrium:

1. No mutations

2. Random mating

3. No natural selection

4. Extremely large population size

5. No gene flow

If we look at the genes of the unicorns on the remote island, gene Glitter Enhancing Protein-7 (Gep7) which is responsible for the amount of sparkles and gene Unicorn Fibroblast Growth Protein (Ufgp) which is responsible for tail length.

It is more likely that Gep7 is not on a Hardy-Weinberg equilibrium. This is because unicorns with more sparkly coats have greater success at finding mates and reproducing, which violates condition No. 2 and 3 which is random mating and no natural selection, respectively. Basing on this statement, natural selection for sparkly coats are happening on the island due to its high relative fitness. This favoring of the sparkly coat causes a shift in the populations frequency curve on one direction, this is called as Directional Selection. Since it is expected to have a greater population of sparkly coats, this disturbs the natural allelic frequencies due to the increase of either p and q, which ultimately disrupts the equilibrium.

Meanwhile, Ugfp, a gene that encodes for tail length and does not affect reproduction, is more likely to be on a Hardy-Weinberg Equilibrium since it abides by the 5 conditions. On actuality, it best exemplifies the second condition, random mating. Since it does not affect reproduction, we can be sure that in a large population, the allele frequency will remain constant and that no change is happening in the gene pool.

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