The sources of genetic variation during meiosis are:a
crossing-over and the random assortment of maternal and paternal chromosomes.
b. crossing-over and random pairing of tetrads.
c. random pairing of tetrads and mutations.
d. polyploidy and random pairing of tetrads.
e. random pairing of tetrads and random assortment of maternal and paternal chromosomes
A
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The diaphragm is a sheet-like skeletal muscle that separates the
(a) thoracic and pleural cavities. (b) thoracic and pericardial cavities. (c) thoracic and abdominopelvic cavities. (d) pleural and pericardial cavities.
Which of the following is not a characteristic of a hormone?
A. chemical messenger B. secreted from glands into the blood C. acts on distant target cells D. regulates organ systems E. secreted from glands into the interstitial fluid
Which of the following controls fluid balance by reabsorption of water and sodium?
A) aldosterone B) antidiuretic hormone C) osmoreceptors D) chemoreceptors
Cancer is a disease of enhanced proliferation and cell survival. DNA repair mechanisms are normally important for cell survival. When a cell senses DNA damage, the cell cycle is inhibited until the damage is fixed
Given the importance of DNA repair mechanisms, how can their failure lead to the production of cancer cells with a competitive advantage over normal cells?