Prior to modern human pregnancy test kits, Xenopus frogs were used - VCE - SSCE Biology - Question 35 - 2021 - Paper 1
Question 35
Prior to modern human pregnancy test kits, Xenopus frogs were used. Urine samples from women were injected into the legs of female frogs. The frogs were then placed ... show full transcript
Worked Solution & Example Answer:Prior to modern human pregnancy test kits, Xenopus frogs were used - VCE - SSCE Biology - Question 35 - 2021 - Paper 1
Step 1
using male frogs instead of female frogs
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Answer
Using male frogs instead of female frogs will not produce eggs, hence it would lead to the conclusion that the woman is not pregnant when she may actually be. Therefore, this option is incorrect for false diagnosis.
Step 2
maintaining an optimum tank temperature
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Answer
Maintaining an optimum tank temperature is crucial for the frogs' health and reproduction. If the temperature is not optimal, it could hypothetically affect the frogs, but does not directly lead to a false diagnosis.
Step 3
replacing the water in the tanks with fresh water each day
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Answer
Replacing the water with fresh water each day is essential for maintaining a healthy environment for the frogs and would not result in a false diagnosis.
Step 4
female frogs laying eggs naturally around the time of the injection
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Answer
This is the correct answer. If female frogs are naturally laying eggs around the time of the injection, it may lead to a positive result unrelated to the woman’s pregnancy, thus contributing to a false diagnosis.
