Humans homozygous for the sickle cell allele have sickle cell anemia. A human that is heterozygous for the sickle cell allele is an example of _____________
A. codominance
B. incomplete penetrance
C. heterozygous advantage
D. multiple allele systems
C
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Common octocorals are the:
a. sea pens. b. gorgonians. c. sea anemones. d. fire corals. e. sea nettles.
Which one of the following activities would be facilitated by the sympathetic nervous system?
A) increased digestion and absorption B) decreased respiratory rate C) increased blood pressure D) decreased heart rate E) increased bladder contraction
Thick, water-storing leaves and stems and shallow, spreading roots are adaptations to
A) deserts. B) tropical rain forests. C) northern coniferous forests. D) tropical scrub forests. E) temperate deciduous forests.
A vasectomy _____
A) eliminates spermatogenesis B) eliminates testosterone synthesis C) prevents implantation of an embryo D) prevents sperm from exiting the male urethra