Why are many human recessive disease alleles maintained in populations despite continuing selection against them?
A) Heterozygotes have a higher fitness than either homozygote.
B) Mutations convert recessive alleles to dominant alleles.
C) Even when the allele frequency is low, many gametes contain the recessive allele.
D) Allele frequency remains constant from generation to generation.
A) Heterozygotes have a higher fitness than either homozygote.
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All of the colonies form on the surface of a spread plate, whereas on a pour plate, colonies may be embedded in the agar as well as on the surface.
Answer the following statement true (T) or false (F)
Fossil fuels are primarily the result of
a. animal bones. b. animal wastes. c. decaying plants. d. worn-away rocks
How many types of nucleotides are found in
DNA molecules?
a. 1 b. 2 c. 3 d. 4 e. 6
How does ecological economics provide a more realistic approach than neoclassical economics?
A. Ecological economics recognizes that certain raw materials are non-renewable. B. Ecological economics eliminates the cost-benefit analysis approach. C. Ecological economics is based on the concept of the "invisible hand". D. Ecological economics attempts to consider the value of ecosystem services. E. Both A and D are correct.