The figure above represents
a. a cephalopod beak.
b. a aquatic snail’s "tongue."
c. a bivalve penis.
d. a squid claw.
e. none of these
B
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Fertilization normally _____
A) reinstates diploidy B) follows gastrulation C) is required for parthenogenesis D) merges two diploid cells into one haploid cell E) precedes ovulation
Which of these statements INCORRECTLY describes an example of pleiotropy?
A. A mutation in a Cl-transport protein causes infertility and excessive mucus in the lungs. B. A mutation in a gene for microtubule formation causes a defect in sperm motility and cilia movement in the respiratory tract. C. A mutation in a lipid metabolism gene leads to a buildup of lipids in cells, causing blindness and paralysis. D. A mutation in the phenylalanine hydroxylase gene can cause mental retardation and loss of motor skills. E. A mutation in one allele for phenylalanine hydroxylase results in lower levels of this enzyme in the blood, which causes high blood levels of phenylalanine.
People with the genetic disease xeroderma pigmentosum have compromised DNA repair mechanisms, making them extremely sensitive to genetic damage from sunlight
Without taking measures to minimize exposure, these individuals typically succumb to skin cancer in childhood or early adulthood–a demonstration of the mutagenicity of ultraviolet radiation. Yet, deliberate exposure in the form of sunbathing is very popular with some segments of the population. Why do you think this is so, and how might public health professionals raise awareness of the danger in which these people place themselves?
The cranial capacity for the species Australopithecus afarensis was close to:
A) 900 cubic centimeters. B) 2,000 cubic centimeters. C) 1,400 cubic centimeters. D) 450 cubic centimeters.