is polymorphic haemoglobin is required for migratory fish? justify your answer
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Elucidating the molecular mechanisms of adaptation is a central aim in evolutionary biology, yet very few studies have identified the genes underlying adaptive variation in fitness-related traits in natural populations. The haemoglobins represent a unique system for studying adaptive changes because these oxygen-carrying proteins closely connect metabolic activities with external conditions. Hence, the haemoglobins have experienced a major evolutionary pressure and acquired a
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