Why can't patterns of inheritance in humans be as easily studied as in peas oe fruit flies?

Patterns of inheritance in humans are more complicated due to ethical considerations in conducting controlled breeding experiments, longer generation times, smaller family sizes, and the inability to control environmental factors that may influence gene expression. Additionally, human genetics involves the study of polygenic traits and complex genetic interactions, which can make it more difficult to identify clear inheritance patterns compared to simpler organisms like peas or fruit flies.