Contractions of the dome-shaped __________ and the intercostal muscles between the ribs alter the
volume of the thoracic cavity during breathing. Fill in the blank(s) with the appropriate word(s).
diaphragm
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A change in genotype, but not in phenotype, is most likely due to
A. a point mutation in the third position of a DNA triplet. B. a nonsense mutation at the beginning of a gene. C. thymine dimer formation in the coding region of a gene. D. a mutation that leads to a frameshift in the middle of a gene.
How many chromosomes do Klinefelter and Turner syndromes have, respectively?
What will be an ideal response?
Skin colour in humans is caused by polygenic inheritance. Which one of the following statements is implied by this form of inheritance?
a. The skin colour of children will always be identical to one parent or the other. b. The skin colour of children will always be intermediate to that of their parents. c. The skin colour of children will most often be identical to that of one of their parents, but sometimes not. d. The skin colour of children will most often be intermediate to that of their parents, but sometimes not.
Actin filaments are bound into bundles of parallel filaments by the proteins
a. filamin and spectrin. b. troponin and tropomyosin. c. profilin and thymosin. d. alpha-actinin and fimbrin e. All of the above