Why did the alleles that conferred insecticide resistance in mosquitoes become less frequent in the population when insecticide application was discontinued in the 1960s in Thailand?
A) The mosquitoes experienced a bottleneck and by chance the surviving insects had a low proportion of resistance alleles.
B) The resistance alleles were linked to a body color variation that led to resistant mosquitoes experiencing a higher rate of predation.
C) A mosquito population with a low proportion of resistant alleles migrated to Thailand and interbred with the original population.
D) In the absence of pesticide, mosquitos homozygous for the resistance alleles had lower fitness than the other genotypes.
D) In the absence of pesticide, mosquitos homozygous for the resistance alleles had lower fitness than the other genotypes.
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Memory cells may take the form of
A. B cells. B. T cytotoxic cells. C. T helper cells. D. All of the choices are correct.
A scientist found an unweathered igneous rock that contained 0.025 g of potassium-40 and 0.075 g of argon-40. The half-life of potassium-40 is 1.3 billion years. Using the table from figure 22.8 the age of the rock would be estimated to be
A. 2.6 billion years old.
B. 0.050 billion years old.
C. 1.3 billion years old.
D. 0.001875 billion years old.
E. 1.69 billion years old.
Most of the animals of mud flats are:
a. planktonic. b. epifaunal. c. oysters. d. infaunal. e. nektonic.
Eukaryotic animal cells have all of the following
EXCEPT a. cell membranes. b. cell walls. c. ribosomes. d. vacuoles. e. Golgi bodies.