View Poll Results: What is the largest cause of phenotypic differences?

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  • Environmental adaptation

    6 54.55%
  • Diet

    0 0%
  • Both have equal effects

    5 45.45%
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Thread: What is the Largest Cause of Phenotypic Differences?

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    Question What is the Largest Cause of Phenotypic Differences?

    just curious of what others think of this subject

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    Sv: What is the largest cause of phenotypic differences?

    Enviromental factors if we're comparing enviroment vs diet but of course then we have natural selection and mutations working alongside those two factors and there might be more factors even that i'm not aware of. The spiecies of man were hunters and gatherers for a long long time, and the evolving of the different phenotypes took place of course pre-agri culture as well as after, as populations scattered across the globe.

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    AW: What is the largest cause of phenotypic differences?

    The phenotype of an individual organism is either its total physical appearance and constitution or a specific manifestation of a trait, such as size, eye color, or behavior that varies between individuals. Phenotype is determined to some extent by genotype, or by the identity of the alleles that an individual carries at one or more positions on the chromosomes. Many phenotypes are determined by multiple genes and influenced by environmental factors. Thus, the identity of one or a few known alleles does not always enable prediction of the phenotype.

    Nevertheless, because phenotypes are much easier to observe than genotypes (it doesn't take chemistry or sequencing to determine a person's eye color), classical genetics uses phenotypes to deduce the functions of genes. Breeding experiments can then check these inferences. In this way, early geneticists were able to trace inheritance patterns without any knowledge of molecular biology.

    The interaction between genotype and phenotype has often been described using a simple equation:
    genotype + environment → phenotype A slightly more nuanced version of the equation is:
    genotype + environment + random-variation → phenotype
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    AW: What is the largest cause of phenotypic differences?

    If speaking about racial physical variation alone, both being equally important, but it depends on the exact environment. F.e. if comparing the Arctic people with those in the tropical jungle, we know that most of the variation will come rather from the environmental influences and pressures other than dietary ones.
    Furthemore an important question would be if subsistence pattern would be included. F.e. no grain eaters without being farmers, no (primarily) meat eaters without being hunters or herders etc.
    So you can't really distinguish certain effects partly, though we know that they work independently too for sure, you find them mostly combined in reality.
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