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08 Jul 2025, 07:05
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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.
In the first study there were found GM genes because hybrids were born right after the escape. Three years later, the hybrids didn't survive long enough to pass on their genes, so GM genes disappeared.
B. Natural predators tend to avoid genetically modified salmon because of differences in their taste.
If GM salmon survive better, their genes should increase in the population, not disappear.
C. Genetically modified salmon are more likely to escape into ocean environments than remain in rivers.
The follow-up was in the same river, so if GM salmon left, their hybrid offspring should still be there unless they died out (as A says).
D. Wild salmon in the river system typically migrate to distant spawning grounds and return only every few years.
The study sampled "hundreds" over three years, enough time to catch returning salmon.
E. Fewer than ten adult GM salmon escaped before the facility was closed.
The first study did detect GM genes, so even a few escaped salmon caused interbreeding.
Correct answer is A
In the first study there were found GM genes because hybrids were born right after the escape. Three years later, the hybrids didn't survive long enough to pass on their genes, so GM genes disappeared.
B. Natural predators tend to avoid genetically modified salmon because of differences in their taste.
If GM salmon survive better, their genes should increase in the population, not disappear.
C. Genetically modified salmon are more likely to escape into ocean environments than remain in rivers.
The follow-up was in the same river, so if GM salmon left, their hybrid offspring should still be there unless they died out (as A says).
D. Wild salmon in the river system typically migrate to distant spawning grounds and return only every few years.
The study sampled "hundreds" over three years, enough time to catch returning salmon.
E. Fewer than ten adult GM salmon escaped before the facility was closed.
The first study did detect GM genes, so even a few escaped salmon caused interbreeding.
Correct answer is A
08 Jul 2025, 07:18
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08 Jul 2025, 07:21
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Argument:
Study 1: Before lab was shut down, GM salmon escaped and interbred with wild salmon
Study 2: 3 years after, the wild salmon was studied using 100 of samples and no trace of GM genes
Pre-Thinking:
The reasons could be, either they migrated somewhere else entirely and no GM offspring was left behind, or these genes weren't long lasting or someone killed the offspring, or maybe enough samples werent tested.
Attacking the answers:
A. Offspring of genetically modified and wild salmon had significantly lower survival rates in the river environment than offspring of two wild salmon. (As per this statement the survival rate is lower but lower means some of them did survive but as per study 2 no traces were found so incorrect.)
B. Natural predators tend to avoid genetically modified salmon because of differences in their taste. (This means they were not killed so they should have survived, we are looking for opposite on why they didnt survive)
C. Genetically modified salmon are more likely to escape into ocean environments than remain in rivers. (This can be a reason they escaped somewhere else entirely)
D. Wild salmon in the river system typically migrate to distant spawning grounds and return only every few years.(This says they go but return o if few returned so there should be minimum traces of gm but that wasnt the case so no)
E. Fewer than ten adult GM salmon escaped before the facility was closed.(Even if fewer then 10 escaped they inbred with wild salmon so some trace should be there)
Answer C.
Study 1: Before lab was shut down, GM salmon escaped and interbred with wild salmon
Study 2: 3 years after, the wild salmon was studied using 100 of samples and no trace of GM genes
Pre-Thinking:
The reasons could be, either they migrated somewhere else entirely and no GM offspring was left behind, or these genes weren't long lasting or someone killed the offspring, or maybe enough samples werent tested.
Attacking the answers:
A. Offspring of genetically modified and wild salmon had significantly lower survival rates in the river environment than offspring of two wild salmon. (As per this statement the survival rate is lower but lower means some of them did survive but as per study 2 no traces were found so incorrect.)
B. Natural predators tend to avoid genetically modified salmon because of differences in their taste. (This means they were not killed so they should have survived, we are looking for opposite on why they didnt survive)
C. Genetically modified salmon are more likely to escape into ocean environments than remain in rivers. (This can be a reason they escaped somewhere else entirely)
D. Wild salmon in the river system typically migrate to distant spawning grounds and return only every few years.(This says they go but return o if few returned so there should be minimum traces of gm but that wasnt the case so no)
E. Fewer than ten adult GM salmon escaped before the facility was closed.(Even if fewer then 10 escaped they inbred with wild salmon so some trace should be there)
Answer C.
Bunuel
