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You have four colonies of mice that are independent of each other. Each has a true-breeding mutation resulting in a short tail. For each colony, the short tail phenotype is recessive to the wild-type long-tail phenotype. You do not know whether these four short tail phenotypes are due to mutations in a single gene, or due to mutations in several different genes, and you decide to find out. After performing all possible pairwise crosses of short-tailed mice among the colonies (colony 1 mouse X colony 2 mouse, etc.), you find that all crosses give you long-tailed mice with the wild-type phenotype. How many genes resulting in short tails are represented among these four colonies?
CO2 levels have increased worldwide due to anthropogenic emissions. Projections suggest these will continue to increase over the rest of our lifetimes.
When does cell division become a factor to consider as we think of the challenges of control of cancer?
Which of these situations would be most positive to the re-establishment of resident zoochlorellae, assume compatible Chlorella are present in P. bursaria's habitat.
In bacteria, it is common fortwo or more structural genes to be arranged together in an operon.Discuss the arrangement of genetic sequences within an operon. What is the biological advantage of an operon organization?
One interesting idea for therapy has been explored in cell culture models. In this case the scientists expressed a specialized form of an snRNA that was normally found in the spliceosome.
If there was mutation in a dna triplet that changed the first triplet from ctt to ctc, would that cause the problem with the resulting polypeptide.
one of the basic tenets of evolution by natural selection is that evolution requires variation upon which selection acts. How might drift prevent selection from acting?
Explain what drives zonation in the marine environment. On what scales can zonation occur? Give examples.
What is phenol red used for in tissue culture work and what does a yellow color change in phenol red indicate in a tissue culture specimen?
what chemical process causes the egg white to change color when it is placed into the hot pan?
Compare and contrast vegetative features (i.e., features not directly involved in reproduction) of bryophytes and gymnosperms. For as many differences as possible, explain how the features of gymnosperms allow them to colonize dry environments bet..
In fruit flies, the recessive v allele results in vermilion (bright red) eyes; the wild type v+ allele results in red eyes. The dominant p+ allele of a second gene is required to produce pigment; the recessive p allele results in white eyes.
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