Answer:
No, one allele does not directly affect another allele. Alleles are alternate forms of the same gene that determine a specific trait, and they do not influence each other's expression directly. However, the expression of one allele can be influenced by other factors, such as the environment or other genes, which may indirectly affect the expression of another allele.
In your example provided, the presence of arms in a drake is determined by one or more alleles of a gene or genes. The presence or absence of legs is determined by a different set of genes, which are not directly affected by the alleles that determine the presence of arms. Therefore, the presence of arms does not imply the presence or absence of legs.