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An article in the Star and Tribune on March 24th stated that chicken breeding has resulted in great changes in the rate at which chickens grow and the size to which they grow - it now takes ~ 42 days to raise a 5 pound chicken, compared to ~ 60 days 30 years ago. Let's say you think this is great, and also think it would be a good idea to breed chickens that grow bigger even faster. You consider two strategies. One strategy is to impose selection for faster growth on chickens living in a facility where each chicken is given the same amount of food, the same amount of space, and lives in a controlled environment in which temperature and day length are regulated. The second strategy is to select for faster growth on chickens living in a pasture where they spend their days pecking around for food and have a hen house from which they are free to come and go.
Explain which strategy you think would lead to more rapid genetically-based gains in the rate at which chickens grow? (assume the starting populations for both strategies have the same genetic composition).
by a series of experiments with sterilized broth, Louis Pasteur disproved the idea of what?
find out the major pathway of glycine degradation. you find that the amino acid serine contains the most radioactivity, and that both the Calpha and Cbeta carbons of the serine residue are labeled with 13C. Explain these observations.
What are some potential research questions that would be interesting to ask of the species prepare a hypothesis and an experiment to test your hypothesis.
Unlike steroid hormones, signaling molecules that are large and/or hydrophilic cannot pass through the cell's plasma membrane and therefore must bind extracellularly to receptor molecules in the plasma membrane.
What does information suggest about the transmission.
Assume you have a bacterial suspension and you need to dilute it to .0010 of the initial concentration so that you can determine thenumber of colonies per milliliter.
Provide a reason why it would be advantageous for eukaryotic cells to evolve elaborate internal membranes systems that allow them to import substances from the outside?
Assume that r, red and sc, scarlet, are two recessive eye-color mutations that lie twenty map unites apart on the Drosphila X chromosome, and that each causes a read eye color in place of the wild type purple color.
Anika's cortisol secretion level falls to normal after the medication, but Bonnie's cortisol secretion remains elevated. Which patient has primary hypercortisolism, also called Cushing's syndrome?
Suppose that a dihybrid cross is made in which the gene loci are autosomal, independently assorting, and incompletely dominant.
How is variability, diploid, independent assortment, crossing over, out breeding mechanisms, polymorphism, heterozygote superiority, hybrid vigor, clines and ecotypes, protogenes, and gene amplification and Pleiotropy relate.
Determine the cell biology of periodontal ligament tissues (PDL) originating from cranial neural-crest-derived extomesenchymal cells.
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