From a standpoint of natural selection, we see that the heterozygous advantage for ?A?S individuals is balanced by the disadvantage to those with SCD or the wild-type alleles (and no malaria protection)
The action of these conflicting trends produces an overall increase in the mutant allele until it reaches a state where the gain and loss of ?S alleles is equal. What is the term for this stable condition that allows mutant alleles to remain in a particular population? A) equilibrium frequency
B) heterozygote fitness
C) restriction fragment length polymorphism
D) single nucleotide polymorphism
E) balanced polymorphism
A
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Which of the following is true for ALL exergonic reactions?
A. The products have more total energy than the reactants. B. The reaction proceeds with a net release of free energy. C. Some reactants will be converted to products. D. A net input of energy from the surroundings is required for the reactions to proceed. E. The reactions are nonspontaneous.
Four of the five choices listed describe a species
Select the exception. a. interbreeding b. sexual reproduction c. natural d. population e. behavior
Thalassemias are associated with a(n) ____
a. amino acid substitution b. extended chain in beta globin c. imbalance in the production of alpha or beta globin d. excessive synthesis of beta globin e. altered rate of oxygen transport
Land plants take up phosphates from ____.
A. rainfall B. seawater C. soil water D. the atmosphere E. animal waste