Question

a student researches the inheritance pattern of dimples in the cheeks of humans. the student records if dimples are present for three subjects and each subjects parents in a table. based on the observations, the student concludes that dimples are inherited from the mother. after reviewing the research, the teacher says that the students procedure needs improvement to reach a valid conclusion about the inheritance of dimples. which procedural change should the student make to improve the validity of the results? include blood types in the data record if dimples are present in the mother only observe the dimples of each subject and the subjects parents using a hand lens trace the trait through multiple generations for each subject to collect more data

Explanation:

The student only has data on three subjects and their parents. To improve the validity of the conclusion about the inheritance of dimples, more data is needed. Tracing the trait through multiple generations for each subject would provide a larger sample size and more comprehensive information about how the trait is passed down. Including blood types (not related to dimple inheritance), recording only the mother (ignores the father's potential role), or using a hand - lens (not relevant to inheritance pattern determination) do not address the lack of sufficient data for a valid conclusion.

Answer:

Trace the trait through multiple generations for each subject to collect more data.