GENETICS AND EVOLUTION
EVOLUTION
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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It reduces the importance of size among salmon, allowing smaller fish to reproduce as often as larger fish.
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It reduces the competition between males which eliminates the need for mating rituals.
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It allows them to conserve energy for the rigorous swim from the ocean upstream to mate.
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It allows them to reproduce with any other salmon which increases the chance of mating.
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Detailed explanation-1: -Some salmon have adapted to be both male and female at the same time. Why would this provide an evolutionary advantage for the fish? It reduces the importance of size among salmon, allowing smaller fish to reproduce as often as larger fish.
Detailed explanation-2: -Mutual mate preference for large body size often leads to size-assortative mating, which appears to be common in salmonids (Table 1). Despite some variation in preference for larger body (e.g. Fleming and Gross 1994), it is one of the most consistent preferences observed in salmonid mate choice.
Detailed explanation-3: -(2) Most fossils are the remains of extinct organisms; that is, they belong to species that are no longer living anywhere on Earth. (3) The kinds of fossils found in rocks of different ages differ because life on Earth has changed through time.