Final answer:
The 'Darwinian paradox' refers to the common occurrence of homosexuality in humans, which seems to contradict the principles of natural selection. The 'failed disfavouring selection' hypothesis suggests that homosexuality may persist in the population due to associated traits that offer evolutionary advantages.
Step-by-step explanation:
The 'Darwinian paradox' refers to the common occurrence of homosexuality in humans, which seems to contradict the principles of natural selection proposed by Charles Darwin. The hypothesis of 'failed disfavouring selection' suggests that homosexuality may persist in the population because it is associated with other traits that offer evolutionary advantages, thereby balancing any disadvantages related to reduced reproductive fitness. This hypothesis suggests that homosexuality is not solely determined by genetic factors but may be influenced by other biological and environmental factors as well.