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TLS Online TPP Program

#Question id: 12462

For most terrestrial ecosystems, pyramids of numbers, biomass, and energy are essentially the same-they have a broad base and a narrow top. The primary reason for this pattern is that

#Unit 10. Ecological Principles
  1. Secondary consumers and top carnivores require less energy than producers.
  2. At each step, energy is lost from the system as a result of keeping the organisms alive. 
  3. As matter passes through ecosystems, some of it is lost to the environment.
  4. Biomagnification of toxic materials limits the secondary consumers and top carnivores.
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TLS Online TPP Program

#Question id: 15382

#Unit 8. Inheritance Biology

In a group of fruit flies homozygous for an allele that causes a reduced number of thoracic bristles, you notice that the number of bristles varies from about half the normal number to only a few bristles. This is an example of which of the following?
TLS Online TPP Program

#Question id: 15383

#Unit 8. Inheritance Biology

You are trying to develop true breeding blue hydrangeas, but the plants in one corner of your plot consistently turn pink regardless of your mating strategy. Which of the following would you suspect?
TLS Online TPP Program

#Question id: 15384

#Unit 8. Inheritance Biology

A trait that appears to be dominant in one sex but recessive in the other is called:
TLS Online TPP Program

#Question id: 15385

#Unit 8. Inheritance Biology

You cross a true breeding normal corn plant with a true breeding plant with variegated seed coat and colorless endosperm. You suspect the genes are linked, so you cross one of the resulting normal offspring to a true breeding variegated, colorless plant. What are your expected results if the genes are completely linked?
TLS Online TPP Program

#Question id: 15386

#Unit 8. Inheritance Biology

You set up a mapping cross involving your favorite gene (YFG) in Neurospora and determine the following octad types: 4:4 arrangement 83; 2:4:2 arrangement 7; 2:2:2:2 arrangement 10. What is the distance between your gene and the centromere?
TLS Online TPP Program

#Question id: 15387

#Unit 8. Inheritance Biology

How might the results of Bernard Davis's U tube experiment have been different if each strain were only mutant for a single gene?