What is heterozygote advantage? Provide one example of this and briefly explain. What will be an ideal response?
Heterozygote advantage occurs when the heterozygote genotype has greater fitness in that
environment. An individual who is heterozygous for sickle cell has an advantage in areas where
malaria is endemic because the heterozygote is more resistant to malarial infection than the individual
carrying two normal hemoglobin genes
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Which of the following characteristics are unique to eukaryotes (i.e., do not occur in either archaea or bacteria)? (Select all correct choices.)
A. the presence of introns in most genes (non -coding stretches of DNA) B. the presence of exons in most genes (coding stretches of DNA) C. the presence of chlorophyll D. the presence of nuclei
Trypanosomiasis is spread by
A. mosquitoes. B. airborne droplets. C. tsetse flies. D. fleas on rats. E. contaminated water.
Uterine contractions are most likely an example of
a. a unique human reproductive phenomena. b. negative feedback. c. positive feedback. d. programmed events. e. positive feedback and programmed events.
A cow converts the energy of glucose into the
energy of ATP. What happens to most of the energy in that conversion?
a. it remains with the glucose- it can’t be extracted. b. it is lost as heat energy. c. it is within the ATP molecule. d. it is recycled back into glucose. e. more than one of these is possible