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Genotypes and Phenotypes: What does this mean?

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Why is a phenotype not always a true reading a of the organism's genotype?

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This provides definitions and examples of genotypes and phenotypes and why what we see doesn't tell us the genes someone is carrying. This includes sex-linked traits, too.

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A phenotype is an organism's outward appearance and only shows us what the dominant trait is, or in some cases a combination of traits, codominance. If, for example, an organism has a parent that carries two dominant traits (homozygous) for black hair (BB) and the other parent carries a dominant and recessive (Bb), which means they are heterozygous, the ...

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