Solved by a verified expert:Thamnophis sirtalis garter snakes eat poisonous newts, Taricha granulosa, containing tetrodotoxin.Resistance to tetrodotoxin is highly heritable in these snakes. Garter snakes must also escape predatorsby moving quickly, and crawling speed is also highly heritable. Selection on both resistance totetrodotoxin and crawling speed are strong. Nonetheless, neither trait increases very much eachgeneration if both are artificially selected in a lab population. Explain this result.quantitative genetics question