The terms "genotype" and "phenotype" refer to different aspects of an organism's biology.
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Genotype: This refers to the genetic makeup of an organism, specifically the alleles it carries for various genes. It is the information encoded in the DNA that can influence traits and characteristics but does not always manifest visibly. For example, if an organism has two alleles for a gene—one for brown eyes and one for blue eyes—its genotype could be described as "Bb" where 'B' stands for the brown allele and 'b' for the blue allele.
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Phenotype: This describes the observable characteristics or traits of an organism, which result from the interaction between its genotype and the environment. Phenotypes can include physical traits such as color, shape, size, and behavior. Using the previous example, if the organism with the genotype "Bb" has brown eyes, then its phenotype would be "brown eyes." Conversely, an organism with the genotype "bb" would exhibit the phenotype "blue eyes."
In summary, the genotype is the genetic blueprint, while the phenotype is the physical expression of that blueprint shaped by both genetics and environmental factors.