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Solution


Q.

Alleles are                   [2015]
1 different molecular forms of a gene  
2 heterozygotes  
3 different phenotype  
4 true breeding homozygotes  

Ans.

(1)

Genes are the units of inheritance and contain the information that is required to express a particular trait in an organism. Alternating forms of a single gene which code for a pair of contrasting traits are known as alleles. For example, two alleles determine the height of pea plant (tall and dwarf).