What will be the approximate effective population size in a panmictic population of 240 with 200 females and 40 polygamous males?

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#Question id: 11183

#Unit 10. Ecological Principles

Which of the following is an example of a density-independent mechanism?

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#Question id: 7085

#Unit 5. Developmental Biology

Experiments by Pieter Nieuwkoop and Osamu Nakamura showed that the organizer receives its special properties from signals coming from the:

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#Question id: 8776

#Unit 9. Diversity of Life Forms

What kind of evidence has recently made it necessary to assign the prokaryotes to either of two different domains, rather than assigning all prokaryotes to the same kingdom?

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#Question id: 12971

#Unit 10. Ecological Principles

One group of ecologists has suggested that producers are limited by competition for resources, primary consumers (herbivores) are limited by predation, and secondary consumers (carnivores) are limited by food. If this were true, at which of the following trophic levels would one expect to find substantial evidence for competitive exclusion?

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#Question id: 64

#Unit 1. Molecules and their Interaction Relevant to Biology

Testosterone and estradiol are male and female sex hormones, respectively, in many vertebrates. In what way(s) do these molecules differ from each other? Testosterone and estradiol ________.