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1.Phenotype refers to the external characters of an organism.eg:color, shape.....
2.Pure line refers to the pure breeding varieties .eg: crossing of tall and tall plants.
3. Expressed character refers to the character that is dominant.eg:among tall and dwarf , tall is the expressed character.
4.Alleles are the alternative expression of same genes.
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PHENOTYPE.thus in F1 generation we can clearly  observe that 75% are yellow ssed producing pea plants and 25% are green ones this is known as phenotype     PURE LINE...plants that expresses a selected character over several genearations such plantss are called pure line
ALLELE....the pair of factors which are responsible for a character is called allele
EXPRESSED CHARACTER.....dominant traits are those that are expressed or seen when a heterozyguous just genotype is present

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