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A cell receives two synaptic inputs at adjacent locations on a dendritic branch. Each synapse, when activated by a single pre-synaptic spike, produces a depolarizing EPSP. From resting potential, these EPSPs create a peak voltage change of +18 mV. If the resting potential is -80 mV and threshold for spike generation is -40 mV, can these two synapses ever cause a spike in the post-synaptic cell? Explain.
Jean Manning, Charles Kerfoot, and Edward Berger studied the frequencies at the phosphoglucose isomerase (GPI) locus in the cladoceran Bosmina longirostris.
A recessive mutant allele, black, causes a very dark body in drosophila when homozygous. The normal wild-type is described as gray. What F1 phenotypic ratio is predicted when a black female is crossed to a gray male whose father was black?
Based on the structure of individual keratin subunits, why would a single point mutation in the alpha-helical region of the monomer result in a defect in the polymer.
A population of 4,000 butterflies at Hardy- Weinberg equilibrium contains 360 indviduals with a recessive phenotype ( genotype aa). What is the frequency of the recessive allele What percent of the islanders would beheterozygous for eyelash lenth
What is the relationship between the variance in allele frequency and the difference between the average observed and expected heterozygosities?
Give 2 distinguishing characteristics of a tRNA molecule. In translation what does the ribosome do? With reference to translation, what does translocation refer to?
a 50-year-old man has been suffering from substernal pain for the last 5 months particularly on waking up in the
An individual with a disease demonstrates a set phenotypic presentation, Another individual with the same phenotypic presentation is discovered. When we sequence their genome, we find that there are two distinct DNA sequences involved, both differ..
According to Darwin, what are three conditions must be met in order for natural selection to occur?
A female rabbit with hemophilia, rickets and a tail was mated to a male rabbit that did not have hemophilia or rickets but lacked a tail.
how does matter flow through biogoelogical systems? How are biological and geological cycles related? identify one nutrient and explain
Would two nucleotides at a time be sufficient to provide enough codons to code for all twenty amino acids? Discuss how many amino acids could be coded for by codons containing only two nucleotides?
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