Assertion (A): In humans, if gene b gives blue eyes and gene B gives brown eyes, then the colour of the eyes of a person having Bb combination of genes will be blue. Reason (R): The recessive gene cannot show its effect in the presence of dominant gene.

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KollegeApply · Accepted Answer

A is false but R is true. Explanation: In this case, B is the dominant gene for brown eyes, while b is the recessive gene for blue eyes. A person with the genotype Bb will have brown eyes because the dominant allele B masks the effect of the recessive allele b. Therefore, Assertion (A) is false. A recessive gene cannot express its trait in the presence of a dominant gene because its effect is masked by the dominant allele. Therefore, Reason (R) is true. Hence, A is false but R is true.

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