What impact does interbreeding have on modern human DNA?

Interbreeding among modern humans has played a significant role in diversifying genetic characteristics. When different populations or species interbreed, they exchange genetic material, which can lead to new combinations of alleles and increase genetic variation within a population. This genetic diversity is crucial for adaptation to changing environments, as it can result in various traits that may enhance survival and reproduction in different contexts.

For example, interbreeding between modern humans and Neanderthals not only introduced new genetic variants into the human gene pool but also contributed to certain advantages, such as improved immune response and other adaptive traits. This genetic mixing showcases how interbreeding can positively influence genetic diversity and potentially strengthen populations rather than weaken them or lead to the development of unique disorders.

In contrast, the other choices hint at either a lack of effect or detrimental impacts that do not accurately represent the outcomes observed through human evolution and genetic studies.