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TLS Online TPP Program

#Question id: 12538

Some global warming models predict that, if permafrost in the tundra regions in the northern hemisphere melts, atmospheric CO2  levels will increase. Which of the following statements best explains this prediction?

#Unit 10. Ecological Principles
  1. The heat released by  the melting  of  the ice  on  such a  vast scale will  cause atmospheric CO2  saturation levels to increase.
  2. All of the tundra producers will die if the permafrost melts, and because the tundra regions are vast in the northern hemisphere the tundra plants will not take part in photosynthetic removal of atmospheric CO2
  3. CO2 tied up in the permafrost ice will be released during a thaw.
  4. All  of  the  undecayed organic material would  be  subject to  decomposition following  a  thaw, which  would lead to incredible increase in global cellular respiration, and add to atmospheric CO2
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TLS Online TPP Program

#Question id: 15004

#Unit 8. Inheritance Biology

Which of the following statements about a pedigree would be most definitive in determining a recessive pattern of inheritance?
TLS Online TPP Program

#Question id: 15005

#Unit 8. Inheritance Biology

You identify a previously unidentified plant species and decide to study its genetics. You establish true breeding strains for leaf shape (longer than wide vs equal length and width) and flower color (white vs. yellow). When you perform a dihybrid cross with these strains, you find that your results are very different than those predicted by a 9:3:3:1 ratio. You calculate a chi square and get a p value of less than 0.0001. Which of the following statements is most accurate based on this observation?
TLS Online TPP Program

#Question id: 15006

#Unit 8. Inheritance Biology

Which of the following is not a mechanism for sex determination?
TLS Online TPP Program

#Question id: 15007

#Unit 8. Inheritance Biology

You set up a cross between true breeding wild type male fruit flies and true breeding female flies with a yellow body color. You notice in the F1 generation that half the flies, specifically all the males, have yellow body color while the females are wild type (gray). Which of the following explanations is the most likely?
TLS Online TPP Program

#Question id: 15008

#Unit 8. Inheritance Biology

You have a white eyed, male fruit fly with vestigial wings and a wild type female known to be heterozygous for both traits. You know that vestigial is located on an autosome. What is the probability that a mating between these two flies will generate a female offspring with vestigial wings and white eyes?
TLS Online TPP Program

#Question id: 15009

#Unit 8. Inheritance Biology

A mutation in which most of the protein coding sequence of the gene is removed is most likely to be which type of allele?