"She is a carrier of the cystic fibrosis trait." This statement acknowledges that this person
A. is homozygous for the trait.
B. is heterozygous for the trait.
C. may be trisomic.
D. has two recessive alleles.
B. is heterozygous for the trait.
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One example of a simple reflex arc involves the
a. contraction of a muscle when it is stretched. b. conscious message to move part of the body. c. receptor, the brain, and the effector. d. muscle action in a salute when a noncommissioned combatant sees an officer. e. contraction of an antagonistic muscle when its opposite muscle relaxes.
Sexual reproduction
a. leads to uniform characteristics in a population. b. results in new combinations of genetic traits. c. produces genetic clones. d. requires less tissue differentiation than asexual reproduction. e. produces genetic clones and requires less tissue differentiation than asexual reproduction.
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.
In photosynthesis, redox reactions ultimately transfer electrons from ________ to ________
A) O2... CO2 B) C6H12O6... O2 C) H2O... C6H12O6 D) H2O... CO2