__ occurs when one gene influences two or more seemingly unrelated phenotypic traits. Select one: a. Pleiotropy b. Mosaicism c. Chimerism d. Heterozygosity

The correct answer is a. Pleiotropy. Pleiotropy occurs when one gene influences two or more seemingly unrelated phenotypic traits. This means that a single gene can have multiple effects on an organism's phenotype, affecting different characteristics or traits.