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Some evolutionary biologists have argued that the neutral theory should be taken as the null hypothesis to explain genetic variation within species or populations and genetic differences among them. In this view, adaptation and natural selection should be the preferred explanation only if genetic drift cannot explain the data. Others might argue that since there is so much evidence that natural selection has shaped species' characteristics, selection should be the explanation of choice and that the burden of proof should fall on advocates of the neutral theory. Why might one of these points of view be more convincing than the other?
Three dominant traits of corn seedlings, tunicate seed, glossy appearance, and liguled stem, are studied along with their recessive counterparts, nontunicate.
Genistein and staurosporin are potent kinase inhibitors. Are genistein ans staurosporin more likely to have an effect in the signal cascade of G-prrotein related or enzyme linked (RTK) receptors.
What is the connection among ribosomes, endoplasmic reticulum, golgi apparatus and the plasma membrane? How do they work together in the system.
The leaves of the Holly tree were discovered to have different densities of stomata depending on whether they were located near the center of the tree or at the periphery.
suppose a bird that eats grasshoppers moves into the prairie. How will this affect natural selection of the grasshoppers? How might this change in a drought year.
If A/A x B/B is crossed with a/a and the F1 is testcrossed, what is the genotype and percenage of every progeny if the two genes are unlinked;
While working in a cell biology laboratory, you are instructed to create a solution that is iso-osmostice to the cells that the lab uses.
Select a neurotransmitter and explain how you would know whether a particular neuron releases this neurotransmitter. Also discuss at least 4 drugs that are used to alter the effects of the neurotransmitter and what they do.
Explain how the structure called a lamella forms compact bone and central canals contain blood vessels and nerve fibers, and extend in what direction through bone?
Determine would you expect yearly net N accumulation in vegetation to be higher in young say, 20 year old, medium or mature 100 year old forests?
Estimate the phenotypic ratios for monohybrid, dihybrid, and trihybrid crosses involving dominant/recessive loci? Using transmission genetics and the rules of probability.
Assume you remove your test cultures from the incubator and notice that one of them- a know fermenter- has a gas bubble in the Durham tube.
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