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07 Jul 2025, 12:16
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Which of the following, if true, most helps to explain the discrepancy between the two studies?
A. Offspring of genetically modified and wild salmon had significantly lower survival rates in the river environment than offspring of two wild salmon. --> This explains why none of the GM genes were found Correct
B. Natural predators tend to avoid genetically modified salmon because of differences in their taste. --> This would actually make GM salmon more likely to survive
C. Genetically modified salmon are more likely to escape into ocean environments than remain in rivers. --> This doesn’t explain their disappearance.
D. Wild salmon in the river system typically migrate to distant spawning grounds and return only every few years. --> we are talking about a local river system
E. Fewer than ten adult GM salmon escaped before the facility was closed. --> we know GM genes were already found in juveniles, so at least one escaped and bred.
07 Jul 2025, 12:25
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A. Offspring of genetically modified and wild salmon had significantly lower survival rates in the river environment than offspring of two wild salmon.
If the hybrid offspring (with GM genes) don't survive well, they would die off before the second study was conducted three years later. This would directly explain why no GM genes were found in the later study.
B. Natural predators tend to avoid genetically modified salmon because of differences in their taste.
This would suggest GM salmon (or hybrids) might have higher survival rates, or at least not lower, due to reduced predation. This would make it less likely for the GM genes to disappear, so it doesn't explain the discrepancy.
C. Genetically modified salmon are more likely to escape into ocean environments than remain in rivers.
Explains why the adult GM salmon might not be in the river, but it doesn't explain why the juvenile wild salmon initially found with GM genes (which presumably grew up in the river) disappeared from the gene pool after three years.
D. Wild salmon in the river system typically migrate to distant spawning grounds and return only every few years.
If the salmon migrate and return every few years, the three-year gap might mean the same generation of hybrid salmon wasn't sampled, or that the current population in the river is a different group. However, the initial study found GM genes in juvenile wild salmon in the local river system. If these juveniles don't survive or reproduce, or if the GM gene itself causes a disadvantage over a few generations, then the genes could disappear.
E. Fewer than ten adult GM salmon escaped before the facility was closed.
While this might suggest the initial impact was small, the first study did confirm the presence of GM genes in juveniles. So, even a small number of escapees managed to interbreed.
Regards,
Lucas
If the hybrid offspring (with GM genes) don't survive well, they would die off before the second study was conducted three years later. This would directly explain why no GM genes were found in the later study.
B. Natural predators tend to avoid genetically modified salmon because of differences in their taste.
This would suggest GM salmon (or hybrids) might have higher survival rates, or at least not lower, due to reduced predation. This would make it less likely for the GM genes to disappear, so it doesn't explain the discrepancy.
C. Genetically modified salmon are more likely to escape into ocean environments than remain in rivers.
Explains why the adult GM salmon might not be in the river, but it doesn't explain why the juvenile wild salmon initially found with GM genes (which presumably grew up in the river) disappeared from the gene pool after three years.
D. Wild salmon in the river system typically migrate to distant spawning grounds and return only every few years.
If the salmon migrate and return every few years, the three-year gap might mean the same generation of hybrid salmon wasn't sampled, or that the current population in the river is a different group. However, the initial study found GM genes in juvenile wild salmon in the local river system. If these juveniles don't survive or reproduce, or if the GM gene itself causes a disadvantage over a few generations, then the genes could disappear.
E. Fewer than ten adult GM salmon escaped before the facility was closed.
While this might suggest the initial impact was small, the first study did confirm the presence of GM genes in juveniles. So, even a small number of escapees managed to interbreed.
Regards,
Lucas
Bunuel
07 Jul 2025, 12:31
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Bunuel
True : Option A –
Offspring of GM and wild salmon were weaker.
They had lower survival rates in the river.
So their genes naturally disappeared over time.
False: Option B:
Predators avoided GM salmon because of taste.
This would help GM salmon survive longer.
So it can’t explain why GM genes vanished.
False: Option C:
Some GM salmon escaped into the ocean.
But GM genes were already seen in baby wild salmon.
So escape doesn't explain their later disappearance.
False: Option D:
Wild salmon migrate and return every few years.
But the study sampled many salmon after 3 years.
Migration doesn’t explain why no GM genes were found.
False: Option E:
Only a few GM salmon escaped the facility.
But even a few can spread genes through mating.
So small number doesn’t explain gene disappearance
Hence ANSWER IS OPTION A
