What effect does a Robertsonian translocation have on chromosome number?
What will be an ideal response?
reduction (2n – 2)
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How does sickle cell disease cause death?
a. The malformed red blood cells cannot transport oxygen. b. The malformed red blood cells can block capillaries. c. The malformed blood cells have a higher affinity for CO2 than for oxygen. d. The mutant hemoglobin polypeptide cannot bind O2 due to a change in three amino acids. e. More cells assume the sickle shape as oxygen concentration in the tissues increases.
Action potentials occur when _____
a. potassium gates close b. a stimulus pushes membrane potential to threshold c. sodium-potassium pumps kick into action d. neurotransmitter is reabsorbed
Ancestry can be traced by maternal lineage using ____________________, and by paternal lineage using
____________________. Fill in the blank(s) with the appropriate word(s).
Shared homologous structures would indicate that two taxa are:a
polyphyletic. b. monophyletic. c. outgroups. d. in different clades. e. homoplastic.