If we follow a population through time and observe that allele frequencies change or genotypic frequencies change in this population, we can conclude:
a. the population size is small.
b. selection is operating on the locus.
c. mating is non-random.
d. Any of the above.
e. All of the above.
D
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Fossil evidence places the origin of angiosperms in the early Cretaceous period, at least 130 million years ago. By 100 million years ago, all of today's major lineages of angiosperms were in place. Angiosperms make up 95% of all modern plant species. Which of the following may help explain the rapid success of angiosperms?
a. Use of the wind to disperse pollen and seeds b. Flowers and fruits help protect and disperse both pollen and seeds c. Use of the wind to disperse spores d. Use of water to disperse pollen and seeds e. Animals eating the plants helped to disperse both pollen and seeds
Who first proposed the concept that simple organic molecules could form spontaneously from simpler raw materials?
a. Miller and Urey b. Charles Darwin c. Thomas Malthus d. Watson and Crick e. Oparin and Haldane
Reproductive isolation
A. is maintained by certain prezygotic and postzygotic barriers. B. is necessary for species to remain separate. C. means there is no gene flow between two groups of organisms. D. All of the choices are correct. E. None of the choices are correct.
10,000 kcal of producer could support approximately _____ kcal of tertiary consumer.
a. 1,000 b. 100 c. 10 d. 1 e. 0