Linkage disequilibrium refers to a condition in which
A) a set of SNPs recombine often.
B) a set of haplotypes recombine often.
C) a set of specific alleles of two or more genes tend to appear together.
D) a set of specific alleles of two or more genes only rarely appear together.
E) a haplotype block rearranges every generation.
C
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The spread of an action potential through heart tissue is made possible by
A. gap junctions. B. tight junctions. C. a network of neurons in the heart. D. myogenic junctions. E. synaptic clefts.
The sex of most mammals, birds, and insects is determined by:
a. the temperature. b. the external environment. c. sex chromosomes. d. chance. e. the internal envronment.
A denatured protein differs from a normal protein because it
A) has lost its usual secondary and tertiary structures. B) is composed of nucleotides. C) contains many disulfide bonds. D) does not contain amino acids.
An anion is formed when
A) an atom gains one or more negatively-charged electrons. B) an atom loses one or more positively-charged protons. C) an atom loses one or more negatively-charged electrons. D) an atom gains one or more positively-charged protons. E) an atom has an equal number of positively-charged protons and negatively-charged electrons.