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Question 3. You are a clinician in a small hospital and are monitoring the progression of myclonic epilepsy (MERRF) in twin boys. One twin remains only mildly affected by the condition, but the other twin develops other symptoms of full blown MERRF, including deafness, ragged red muscle fibers, and ataxia (loss of ability to control muscles). Use a diagram that includes chromosomes, genes, alleles to explain the phenotypic dissimilarity in these identical twins. In respect to MERRF what is the genotype of the mother?Question 5. In the following question we are dealing with a diploid organism. You have justisolated a new embryonic lethal mutation (a single mutation in one gene) that is a little peculiarbecause three distinct phenotypes have been associated with this mutation:Phenotype 1: viable, minor anterior deformity.Phenotype 2: more severe than above, anterior defect and is embryonic lethal.Phenotype 3: like phenotype 2 it is an embryonic lethal, but halts development even earlier.They appear in the following crosses:Cross 1: male +/- x female +/- : 1/4 phenotype #1; 3/4 normalCross 2: male +/- x female -/- : 1/2 phenotype #2; 1/2 phenotype #3Cross 3: male -/- x female +/- : 1/2 phenotype #1; 1/2 normalCross 4: male -/- x female -/- : all display phenotype #3a) Explain the difference between phenotype #1 and phenotype #2. Which phenotype represents the maternal effect phase, the zygotic phase and why?b) Why does this gene have both a maternal and a zygotic phase? How does phenotype #3 arise?
Assume you leave a culture inthe 37 C incubator with out tryptophan for week instead of overnight like you planed. to your surprise culture has shown some visible growth so you reinoculate from that flask into a new flask
List two possible mutations that might cause this phenotype. Be as specific as possible about the location of mutation. What led physician to make this diagnosis, and what might have caused the sudden attack.
In maize, a dominant allele (A) is essential for seed color as opposed to colorless (a). Another gene has a recessive allele (w) which results in waxy starch, as opposed to normal starch (W).
Two species of garter snakes live in the same geographic area. One generally lives in water and the other mainly on land, so that they rarely encounter each other and do not interbreed. This is an example of what category of genetic isolation.
The characteristic (trait) could be something like coloration pattern, length of the limbs, size of the teeth or beak, or any measurable trait that is inherited.
When did dinosaurs and pterosaurs become extinct? Which are the only extant animals that descended directly from dinosaurs.
The best characterization of apoptosis is: the unwanted, unexpected death of a cell. cell death is a normal consequence of a cell living long enough to eventually be killed by accident.
Hydrolases are one important class of enzyme that function to catalyze.
Elucidate where they came from with an easy diagram. The 10 with normal wings also have mutant green eyes and mutant hairy legs.
Explain the two consecutive splicing steps that result in removal of introns. Splicing fidelity relies on specific recognition of introns by the splicing machinery.
The expression and purification of rGFP started with the increase of the bacterial culture and ended with elution of rGFP off the Ni+2 agarose coloumn.
Speculate on and/or research potential mechanisms which would afford the improved processing. Speculate on and/or research potential mechanisms.
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