Final answer:
Reproductive asymmetry in primates is evident through the roles in pregnancy and childcare, with females being more involved, and through sexual dimorphism, with males generally being larger as a result of selection pressures related to mating competition.
Step-by-step explanation:
The reproductive asymmetry between primate males and females can be observed in their differing roles and physical characteristics related to reproduction and caring for offspring. Primarily, adult females experience pregnancy and bear offspring, spending a significant portion of their adult lives either pregnant or nursing. They also devote more time to care for young, compared to males. Besides, juvenile females show more interest in primate babies than juvenile males do.
Sexual dimorphism, the size difference between males and females, is another aspect of reproductive asymmetry. Males tend to be slightly larger than females, which can be explained by the variance in reproductive success. This variance leads to a strong selection pressure among males to be bigger and stronger or more decorated to be successful in mating, while females usually have a more selective mating pattern, choosing more desirable males.