Final answer:
In subsequent generations, the percentage of non-singing females would be expected to increase due to the continuation of the non-singing trait.
Step-by-step explanation:
In subsequent generations, there would be a higher percentage of non-singing females due to the continuation of the non-singing trait. The exact percentage cannot be determined without additional information, but it would likely increase with each generation. For example, if Generation 3 has 20% non-singing females, Generation 4 might have 30% non-singing females, and Generation 5 might have 40% non-singing females.