In cattle, the gene for red coat color (R) shows no dominance over the gene for white (R) coat color. The hybrid (RR) is roan color. If the coat color phenotypes are known in a population of cattle, you can calculate the allele frequencies for the R and R alleles

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the cell is the smallest structural and functional unit of living organisms, which can exist on its own. therefore, it is sometimes called the building block of life. some organisms, such as bacteria or yeast, are unicellular—consisting only of a single cell—while others, for instance, mammalians, are multicellular.