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An endemic fish living in freshwater blue hole in the Bahamas, Poecilia bahamania, has two color morphs, a red and blue morph. You have observed that an invasive species of cichlid that was introduced to the blue hole five years before seems to prefer to eat the red morph of the native fish. You even go so far as to conduct an experiment that the cichlid will eat the red Poecilia twice as often as the blue. However, in those five years, the relative frequency of Poecilia has not noticeably changed. What might account for this observation and might natural selection ever cause the population to lose the red morph?
A hormone such as epinephrine binds to the same receptors but produces different responses in the liver, skeletal muscle, and cardiac muscle. How can epinephrine produce three different responses?
A certain gene consists of 450 nucleotide pairs.How various codons make the 150 residues.
Data indicate that we are currently in the sixth mass extinction event in the history of the earth. The first five mass extinction events are known from fossils of hard-bodied animals that lived in shallow seas. Why is so much about what we know a..
Based on its structure, explain how the synaptonemal complex could actually represent an obstacle to recombination.
In mid afternoon, they are on it's under surface, each caterpillar hanging by a few legs. Offer a hypothesis to explain this behaviour. How would you test it.
Explain the prevalence of the cervical cancer in 1999 and 2004? Specify how many women were at the risk of developing the cervical cancer before being screened in: 1999, and 2004.
Suppose that you are working with Drosophila and are studying genes, a, b, c, d, e, and f that are all linked in a region on a chromosome, but their order is unknown.
Predict and explain the effect on GAL1 transcription, in the presence of galactose alone, of the following mutations.
find the momentum of a charge (3.2e-19) that moves perpendicular to a uniform magnetic field B of magnitude 0.20T and has radius of curvature of 4.0cm. Momentum=mv
Compare the control of gene regulation in eukaryotes and prokaryotes at the level of initiation of transcription.
Why do you plate only a small amount of the bacterial solution on the Ampicillin-treated plates, and an even smaller amount on the plates without Ampicillin, when you are trying to calculate transformation efficiency.
The signaling mechanisms used by a steroid-hormone receptor and by an ion channel linked receptor have very few components. Can either mechanism lead to an amplification of the initial signal? If so, how? Ideas are included.describe an amplificati..
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