You discover a rare new bird species, but you are unable to observe its mating behavior. You see that the male is large and ornamental compared with the female. On this basis, you can probably conclude that the species is A) polygamous
The impact of animal behaviour on fitness (the capacity to live and reproduce) and evolution is a topic of great interest to ethologists. The third and fourth questions in Tinbergen's series reveal his enthusiasm for fitness and evolution. There is evidence that genes at least partially control many animal behaviours.
However, there aren't any genes that directly encode behaviour. Proteins are encoded by genes and a single change to a protein can have significant effects on several bodily functions. It has the capacity to significantly affect a person's phenotype, or outward characteristics.
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