Today we began our brine shrimp lab,
which explores mutations in a species population of brine shrimp. We created 30
mL of 0%, 0.5%, 1%, 1.5% and 2% NaCl water. We put these waters into separate Petri
dishes and labeled the lids. We then put a short piece of tape on a slide and
used a paint brush to put roughly 20 eggs on these. Next we counted the eggs
using a microscope to count and record how many each had. We placed these in
the water. After 24 hours, we came back, recorded the number living, and
extracted them. After another 24 hours, we did the same. We noticed that a
molarity of .5% water had the highest number of brine shrimp that lived. This
showed that the mutation to live in .5% water was the most common in our
population. However, some shrimp in the population were mutated to survive in
all the other waters as well, just not as high of a percentage.
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| Two of our labeled petri dishes with brine shrimp. |
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| A really bad picture of brine shrimp eggs. |
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| Really tiny living brine shrimp. |
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