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Q1. In the wild, male house finches (Carpodus mexicanus) vary considerably in an amount of red pigmentation in their head and throat feathers, with colours ranging from pale yellow to bright red. These colours come from carotenoid pigments that are found in the birds' diets; no vertebrates are known to synthesize carotenoid pigments. Therefore, the brighter red the male's feathers are, the more successful he has been at acquiring the red carotenoid pigment by his food-gathering efforts (all other factors being equal).
Throughout breeding season, one should expect female house finches to prefer to mate with males with the brightest red feathers. Which is most completely describes the sort of evolutionary change that will occur in this situation?
Q2. Tony sometimes seems very "wound up." At those times, he seems full of energy, talks very rapidly, and makes very grandiose plans. (One time, he gave away all of his belongings and was planning to move to Washington, D.C., so he might advise the President.) At these times, he also seems to need almost no sleep. All through other periods of time, Tony seems very "down." throughout these times he does not take care of himself. He seems to want to sleep all the time, and he often makes thinly veiled references to wanting to commit suicide.
Suppose that you have engineered a set of genes, each encoiding a protein that altered signal sequence. If the genes were expressed in a cell.
A fruit fly was found to be heterozygous for a paracentric inversion. However, it was impossible to obtain flies that were homozygous for the inversion even after many attempts. What is the most likely explanation for this inability to produce a h..
One class of aminoacyl tRNA synthetases possesses "proofreading" abilities. An experiment was carried out where a cysteine attached to tRNA was chemically modified to an alanine.
q. a diploid cell contains three pairs of homologous chromosomes designated c1 and c2 m1 and m2 and s1 and s2. no
when chicken egg whites( which are chiefly composed of proteins) are heated they harden although we cannot reverse this process, we can dissolve the hardened egg white if we heat it in a solution containing a strong detergent.
Describe how a slight (but smooth) contraction differs from a vigorous contraction of the same muscle using the understandings of multiple motor unit summation.
Yet, TH1 cells do not directly cause tissue damage. What cells are activated by TH1 cytokines, and what do these cells do to cause damage?
A feature detector in the visual cortex is most likely to answer which of these questions?
Describe how the lymphatic system can hinder the spread of cancer. Describe how the lymphatic system may actually aid in the spread of cancer.
Give the example of a non-vascular plant, a vascular spore producing plant, a cone-bearing plant, and a flowering plant. What do all of these taxa have in common
MN blood types were assessed for a population that consists of 100 individuals: 45 have blood type M, 30 have blood type MN and 25 have blood type N. Is the population in Hardy-Weinberg Equilibrium with regards to this locus? Show your calculation..
Compute the total number of ATP molecules that will be produced upon complete breakdown of one C18 fatty acid molecule.
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