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Phenotype refers to the difference in outer characters of any kingdom.
Allele are alternative form of genes.
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Phenotype: Phenotype is defined as the characters which can be seen is known as phenotype
Allele: The pair of factors  which are responsible for a character is called allele
Pure line:a breed or strain of animals or plants in which certain characters appears in successive generation as a result of inbreeding or self fertilization