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A dominant allele H reduces the number of bristles that Drosophila flies have, giving rise to a "hairless" phenotype. In the homozygous condition, H is lethal. An independently assorting dominant allele S has no effect on bristle number except in thje presence of H in which case a single dose of S supressess the hairless phenotype, thus restoring the hairy phenotype. However, S also is lethal in the homozygous (S/S) condition
a. What ratio of hairy to harless flies would you find in the live progeny of a cross between two hairy flies both carrying H in the supressed condition?
b. When the hairless progeny are backcrossed with a parental hairy fly, what phenotypic ratio would you expect to find among their live progeny?
The incidence of most cancers increases with age in a non-linear fashion. Assuming that the rate of mutation is constant throughout life, why do you suppose the incidence of cancer increases so dramatically with age?
A recessive allele on the X chromosome is responsible for red-green color blindness in humans. A woman with normal vision whose father is color-blind marries a color-blind male. What is the probability that the couple will have a color-blind offsp..
What happens to the average speeds of the particles in a gas when one increases that gas's temperature?
Is this an instance of a positive or negative feedback mechanisms? What is the initial stimulus? What is the result.
When did dinosaurs and pterosaurs become extinct? Which are the only extant animals that descended directly from dinosaurs.
Having studied the usefulness of restriction enzymes and the process of molecular cloning, propose a use for these two genetic technologies.
A two year old boy is being seen through a hematologist. The child's symptoms include the sudden onset of high fevers, thrombocytopenia, epistaxis.
give an example of a catabolic and anabolic reaction, and write it as a chemical equation, identify where the energy is, and why that reaction is important.
If the sample were heated with Methylene Blue stain and counterstained with Carbofushin will you still be able to determine which bacterium were acid fast? If so, which colour would indicate acid-fast.
why is Coral reefs are decreasing in size globally?
How would you interpret this result? How might such a phage replicate its DNA.make sense in terms of Chargaff's rules.
How could future researchers determine if the distribution of bryophyte and lichen species on a tree were set primarily by abiotic limitations, or by interactions with other species?
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