Final answer:
There are several disadvantages to studying human genetics, including genetic discrimination, the difficulty of ensuring genetic privacy, and ethical concerns surrounding human genetic engineering.
Step-by-step explanation:
Studying human genetic characteristics brings several disadvantages. First, there is the potential for genetic discrimination, where people may be treated differently based on their genetics, such as in employment or insurance. Second, the concept of genetic privacy is at risk; once genetic information is out, it is difficult to control who may access or use it. Lastly, there are concerns about the ethical implications of human genetic engineering, where the power to alter genes could lead to contentious questions about the nature of being human. All these disadvantages necessitate careful ethical, legal, and social consideration to prevent misuse of genetic information and safeguard individual rights.