What is key to recognition of a trait whose expression is determined by the effects of two or more genes (polygenic inheritance)?
A) A mating between a homozygous and a heterozygous individual produces more than the expected number of offspring expressing the dominant trait.
B) All of the alleles of the gene for that trait are equally expressed.
C) Pleiotropy occurs.
D) The trait varies along a continuum in the population.
D
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According to most car mechanics, plain water is the best coolant to use in an engine provided the engine is not being exposed to freezing temperatures. If the car is subject to freezing temperatures then a mixture of water and ethylene glycol (antifreeze) is recommended but it does not cool as efficiently as plain water. Why would ethylene glycol reduce the cooling efficiency of water?
A. Hydrogen bonds in water allow high levels of heat absorption and a large increase in temperature. B. Ethylene glycol raises the freezing point of water. C. Ethylene glycol has a lower heat capacity than water. D. Ethylene glycol has a higher heat capacity than water.
The chemical 5-bromouracil mimics the chemical structure of thymine, making it a(n) (analog/nucleotide/precursor) of thymine
What will be an ideal response?
A person reports to a clinic complaining of fever and abdominal pain. The abdomen is swollen, and blood tests indicate liver damage. A stool sample is examined under a microscope and found to contain eggs with a spine projecting from its surface. The indications are consistent with infection with
A) Ancylostoma duodenale. B) Enterobius vermicularis. C) Echinococcus granulosus. D) Schistosoma mansoni. E) Taenia solium.
________ is the most common form of nitrogen exported from terrestrial ecosystems in stream water
Fill in the blank(s) with correct word