Which best describes crossing over?
A. It occurs during mitosis and reduces the chances of genetic variation in organisms.
B. It occurs during mitosis and increases the chances of genetic variation in organisms.
C. It occurs during meiosis and reduces the chances of genetic variation in organisms.
D. It occurs during meiosis and increases the chances of genetic variation in organisms.
Ans: D. It occurs during meiosis and increases the chances of genetic variation in organisms.
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Which of the organs listed is not part of the GI tract?
A. gallbladder B. esophagus C. stomach D. small intestine
Examine Figure 44.1 in your text. According to this phylogeny, bilaterians (animals with bilateral symmetry) are most closely related to:
A. cnidarians. B. sponges. C. the group containing sponges and cnidarians. D. the group containing choanoflagellates, sponges, and cnidarians. E. None of the answer options are correct.
During Mendel's time, a widely accepted theory called ____ suggested that evolution occurred in spurts rather than by
gradual change.
a. catastrophism b. uniformitarianism c. mutationism d. natural selection e. genetic transformation
You have conscious control over
A) muscles that propel urine from the kidney to the bladder. B) the external urethral sphincter. C) muscles that cause the bladder to contract. D) the internal urethral sphincter.