For processes such as those in the figure that can take thousands of years, how can we know that succession can occur in this way?
A) via carbon dating
B) via chronosequences
C) via long-term studies
D) via the phytoplankton community
B
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Which of the following statements could explain why BC homozygous birds are unusually small?
Black-cheeked BC zebra finches are extremely desirable, but relatively rare. This phenotype is caused by a recessive mutation, but the mating of two BC birds is considered unethical because it results in very small birds. Therefore, BC birds are created by crossing carriers of the BC gene. Despite problems with the homozygous recessive, some unscrupulous breeders continue to breed them together because of the high prices they fetch. A. The BC gene causes a mutation in a growth gene. B. The BC gene and a gene for growth are very close to one another on the same chromosome. C. The BC gene and a gene for growth are both mutated. D. The dominant version of the cheek color gene (GC) encodes a gene for normal size. E. The BC gene and growth gene are close together on the same chromosome and/or both of these genes are mutated.
The function of nectar is
A. provision of carbohydrates for the plant. B. attraction of pollinators. C. preservation of delicate flower parts. D. a sticky trap for parasitic insects. E. prevention of desiccation.
A male with an X-linked recessive disorder mates with a female who is a carrier for this same X-linked recessive disorder. Which of these is the correct expected frequency of this disorder in their children?
A. 50% frequency in the sons B. 50% frequency in the daughters C. 50% frequency in both the sons and the daughters D. 100% frequency in the sons
The evolution of eukaryotes from prokaryotes probably
A) occurred many times. B) allowed for the formation of both complexity and multicellularity. C) involved endosymbiosis on multiple occasions. D) B and C only E) A, B, and C