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Osmotic balance is critical for fishes to maintain, particularly those that move between waters with differing concentration gradients of solutes, particularly salts. Anadromous fishes such as many of the members of the family Salmonidae migrate between marine and freshwater habitats for reproduction, and provide insight into many aspects of osmoregulation in fishes. In thinking about the evolution of the bony fishes, which evidence suggest first emerged in freshwater habitats, a key question relates to how the bony fishes were able at some point to invade marine habitats. Forms that migrate between marine & freshwater habitats (such as Pacific Salmon) may provide some clues to that evolution.
For this reflection, speculate on whether the ancestral line of the Salmonid fishes were marine in origin or freshwater in origin. That is, did anadromy in the Pacific Salmon evolve from 1) an ancestor that lived in the ocean but at some point gave rise to fishes that lived in the ocean but began moving to freshwaters to reproduce or 2) an ancestor that lived in freshwater but at some point gave rise to fishes that lived in freshwater streams but made excursions into the ocean for periods before returning to the streams for reproduction?
A signalling pathway in the cell is turned on by phosphorylation, leading to reduces in cell division. Determine the effect of a mutation that results in the overexpression of an oncogene coding
Rarely, hens reverse phenotypic (not chromosomal dew late in life and develop into sprem producing males. If such a male were to be mated to a normal female,what sex ratio will be expected among the offsrping.
Sometimes when a person is experiencing a heart attack they feel a sharp pain in their left arm. Their arm is not actually hurt, so explain how the wires get crossed and mind perceives pain in wrong place.
Results of this analysis show that one of the most rapidly reassociating classes of DNA is substantially reduced in the older individual with respect to the 2 year-old. How can you describe this finding.
Certain unscrupulous operators offer, for a fee, to freeze recently deceased individuals in liquid nitrogen until medical science can cure the disease from which they died. What is the biochemical fallacy of this process.
Difference between a hereditary germline cancer, such as those caused by BRCA1 mutations, and cancers that result from two somatic mutations in the same gene in the same cell.
In our experiment, we had 2.0 mM solution and we diluted different volumes of it into sodium carbonate before reading in the spec. These were our dilutions.
Critically discuss three of the test systems used to study the effects of a toxicant on chromosomes, describe each test system, and discuss one advantage or disadvantage of that particular test system.
Explain what type of training is most beneficial for ice skating and why. Are there adverse side-effects on the body from such long-term and/or intense training?
What types of member molecules may be distributed asymmetrically?how to maintain asymmetry despite its fluid consistency.
What is a main property of DNase that makes it useful for assessing whether chromatin is in a closed (tightly condensed) or open (loosely packed) configuration.
Explain the difficulities of living in the epipelagic? Discuss and describe three adaptations for dealing with the difficulities you described to answer the question above.
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