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Question: Each olfactory receptor (OR) gene is involved in detecting specific odors. However, humans are losing OR genes: while mice and other mammals have ~1500 such genes, humans have ~900 (the rest received deactivating mutations that turned them into pseudogenes). One such gene is associated with detecting the odor of an asparagus breakdown product in urine; it is active in 25% of humans but has been deactivated in the rest of the human population. Imagine you figured out which OR gene was associated with the trait, and found that individuals with two broken copies (aa) lost the ability to detect asparagus in urine, while those with at least one intact copy (AA or Aa) were able to detect it. In a population analysis, you found 3 AA, 22 Aa, and 75 aa individuals. Test for HW equilibrium and draw conclusions about evolutionary forces acting on the population. Were you able to detect the activity of mutation in the population? Why or why not, do you think? (Hint: At what rate do mutations accumulate in a population?)
Explain the general pattern of alternation of generation in plants. Explore why the gametophyte has been reduced to a part (or parasite) of the sporophyte as plants have evolved. Present and defend your finding. Please list sources used. Write in Tim..
In the procedure of carbon fixation, RuBP attaches CO2 molecule to produce a six carbon molecule, which is then split in two. After phosphorylation and reduction, what more needs to occur in the Calvin cycle.
Protein transport into the endoplasmic reticulum or mitochondria needs unfolding the protein and threading the amino acid chain through a channel or pore into organelle.
How does the net amount of energy released during the breakdown of sucrose compare between spontaneous reactions and catalyzed by sucrase.
Explain a specific example of a cross in two parents, each homozygous for different traits, which would result in a phenotype that is distinct from either parental phenotype.
There are a many respiratory diseases that can affect a person's ability to maintain a healthy respiratory system.
Metabolism uses various ways to ensure that 2 opposing pathways do not occur at the equal time. For the following pair of pathways list 2 ways (different cell location, allosteric effector, covalent modification, different intermediate, different ..
The dominant bonds holding together non-polar compounds that are immersed in aqueous solution are, and the forces that hold pure solutions of non-polar compounds are
A new drug targets renal function through changing ion transport from the filtrate to the interstitial fluid. This particular medicine blocks active transport of sodium in the nephrons.
Give examples of 2-different relationships that fungi have with other organisms. Indicate the type of relationship and explain why it was classified as such.
Discuss why is even weak selection still stronger than drift in very large populations at non-neutral loci?
how to Define the terms anabolic steroid. Discuss the potential risks and dangers associated with using steroids and human growth hormone.
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