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Think about the following hypothetical scheme of determination of coat color in a mammal. Gene A controls the conversion of a white pigment P0 into a gray pigment P1; the dominant alleleA produces the enzyme necessary for this conversion, and the recessive allele a produces an enzyme that is inactive. Gene B controls the conversion of the gray pigment P1 into a black pigment P2; the dominant allele B produces the active enzyme for this conversion, and the recessive allele b produces an inactive enzyme. The dominant allele C of a third gene produces a polypeptide that completely inhibits the activity of the enzyme produced by gene A; that is, it prevents the reaction P0 ® P1. Allele c of this gene produces a defective polypeptide that does not inhibit the reaction P0 ® P1. Genes A, B and C assort independently and no other genes are involved. In the F2 of the cross AAbbCC x aaBBcc, what is the expected phenotypic segregation ratio?
An amateur horse breeder has acquired four new bay-coloured mares (female horses) with uncertain pedigree. What are the probable genotypes of the mares purchased.
Now that you've arrived at the lung, describe the structures you see and narrate how the body combats the invading bacterium using the knowledge you have grinded in the first 4 units. Address both specific and nonspecific immunity and the cells that ..
Wrap up the report by explaining the integration of the body systems in maintaining homeostasis. You should include at least the circulatory, digestive and urinary systems in the explanation.
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.
If some cell-surface receptors, including cytokine receptors and notch, can rapidly signal to the nucleus by activating latent transcription regulators at the plasma membrane, why do most cell-surface receptors use long, indirect signalling cascades ..
Plasmids, which are associated with membrane proteins, depend on bacterial chromosomal DNA for replication. If the genome contains ~30,000 genes, about how many genes would be removed by a deletion of DNA that might be detected by karyotype analysis.
Describe the relationship between biological psychology and other fields in psychology and neuroscience.
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.
What must the intracellular 3-phosphoglycerate/1, 3-diphosphoglycerate ratio be to make the phosphoglycerate kinase reaction thermodynamically favourable in the direction of 1, 3-diphosphoglycerate synthesis.
What is the possibility that they will have a daughter that has the disease. Vitamin-D resistant rickets is a sex-linked dominant trait.
How do plant and animal cells metabolize energy in complementary ways? What does this suggest about the flow of energy and the recycling of elements through living organisms? Could we think of any other similar relationships.
Suppose the gene for dimples, d, is recessive. Then suppose that two individuals with the genotypes Dd and dd mate.
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