Question

Describe the first hypothesis that scientists have about blindness in the Mexican tetra.
Be sure to discuss pleiotropy in your answer. use simple words and 2-3 sentences

Answer 1

Scientists believe that blindness in the Mexican tetra fish, also known as the blind cavefish, happens because of changes in genes that affect multiple traits. This idea is called pleiotropy, where one gene influences several characteristics. In this case, the gene changes that cause them to lose their eyesight might also help them adapt to living in dark caves, affecting things like their body shape or behavior.