The genetic engineering of crops is a controversial and debated issue in the media and press. Which of the following would be an argument in favor of the genetic engineering of corn?
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1 point
improved nutritional content
increased crop yields
reduction of pesticide use
all of these
All of these would be arguments in favor of the genetic engineering of corn.
Both of Tim's parents have brown eyes, but Tim has blue eyes. How is this possible?
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1 point
The characteristic (blue eyes) is carried in a recessive gene.
This characteristic (blue eyes) must be carried in the dominant gene.
Eye color is not a genetic trait.
all of these
The characteristic (blue eyes) is carried in a recessive gene.
Over time, the climate of a region becomes cooler. How will this most likely affect the species living in that region?
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1 point
Some species that already have or that develop cold-weather adaptations through natural selection will survive, while species without cold-weather adaptations may go extinct.
All of the current species living in the region will migrate to warmer areas, while species adapted to cold-weather climates will migrate into the region.
All of the current species living in the area will become extinct, and new species better adapted to the climate will form and populate the region.
Most of the current species living in the area will develop beneficial mutations, which will lead to adaptations that help them survive in the new climate.
Some species that already have or that develop cold-weather adaptations through natural selection will survive, while species without cold-weather adaptations may go extinct.
If there were no decomposers, which of the following would most likely happen?
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1 point
Some plants might die due to a shortage of important nutrients.
The amount of dead plant and animal matter would decrease.
Plants and animals would remain living for a longer period of time.
Animals would start carrying out photosynthesis.
Some plants might die due to a shortage of important nutrients.
What genetic factor is most likely to result in the extinction of an entire species?
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1 point
a lack of genetic variety in the population
a genetic defect in a few members of the population
a genetic resistance against many diseases
a lot of genetic variety in a population
a lack of genetic variety in the population
Which of the following is true of a parasitic relationship?
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1 point
The parasite benefits, and the host is harmed; however, the host is not generally killed.
The parasite benefits, and the host is killed.
The parasite benefits for a time; however, both the parasite and the host eventually die as a result of the relationship.
The host benefits from the relationship, and the parasite is harmed.