Respuesta :
Alleles are one of two or more another form of gene that may result to mutation and originate at the identical place on a chromosome. The "G" allele is collective among African descendants and causes larger amount of the dark pigment melanin to be existing in skin cells, while the "A" allele is communal among European descendants and causes a smaller amount of melanin in skin cells.
The mentioned situation is possible if the Africans and European have this descended from the common ancestor.
Further Explanation:
There are many genes we have many different forms in the organisms. And allele is that variant of the gene. There are two alleles for the same character in all the diploid organisms where each allele come from different parent. For example, the gene for color of the eye has two alleles in organism one of which comes from the mother and the other come from the father. There may be several reasons for mutations or modification of the gene. In this case, there might be a common ancestor for both the African population and the European population. The only difference is that the European population may possess a modified gene that codes for less melanin and this modification leads to change in color of the European people. On the other hand, the African population possess the ancestral gene due to which there is high production of melanin. the ancestral allele which is found in Africans happens to be there because no modification happened in the African allele. It is the same allele that got modified in the Europeans.
Learn more:
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Answer Details:
Grade: High School
Subject: Biology
Chapter: Genetics
Keywords: Genes, alleles, variant, diploid organisms, European population, African population, common ancestor, genetic modification, mutations, melanin, genetics.
