The Character 'Hairless' in the Mouse

The document discusses the "hairless" trait in mice, which is a recessive genetic condition leading to a lack of hair, abnormal skin structures, and other physical abnormalities. Despite initial health issues, hairless mice have adapted to their condition, with their thickened skin compensating for the lack of fur in temperature regulation. The study indicates that the hairlessness is due to the skin's genetic inability to respond to hair-promoting factors, rather than an endocrine deficiency. This mutation may provide insight into how some mammals could have lost their fur through sudden genetic changes rather than gradual evolution.