Genetic And Molecular Basis Of Development

Statement (1): This statement is correct. In genetics, while typically a single gene governs a single trait, pleiotropy occurs when one gene influences multiple traits. For example, a mutation in a single gene may result in various effects on different body systems or functions.

Statement (2): This statement is incorrect. The AB-blood group is an example of co-dominance, not involving one dominant allele and another recessive allele. The A and B alleles are both dominant. When both alleles are inherited, both traits are expressed equally, resulting in the AB blood group. There is no recessive allele in this case.

Thus, the correct answer is (B) : Statement (1) is correct.