Q8 of 53 Page 32

How are alleles of particular gene differ from each other? Explain its significance.

When the allelic pairs of genes are identical then they are called homozygous and when the alleles of gene are different it is heterozygous. For example in case of the trait : height; we have TT and tt to show homozygous and Tt to show heterozygous.

Now in a pair of dissimilar factors one dominates the other and hence called dominant factor while the other called as recessive factor. The dominant one is denoted by upper case and recessive one with lower case. For example T is used for tall and t for dwarf of the same character- height.


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“Genes contain the information that is required to express a particular trait.” Explain.

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In a monohybrid cross of plants with red and white flowered plants, Mendel got only red flowered plants. On self-pollinating these F1 plants got both red and white flowered plants in 3:1 ratio. Explain the basis of using RR and rr symbols to represent the genotype of plants of parental generation.

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For the expression of traits genes provide only the potentiality and the environment provides the opportunity. Comment on the veracity of the statement.