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Q1. Some dogs have erect ears; others have drooping ears. Some dogs bark while following a scent; others are silent. Erect ears and barking are because of dominant alleles located on different chromosomes. A dog homozygous for both dominant traits is mated to a droopy-eared silent follower. The expected phenotypic ratio and genotypic ratio in the F-1 generation.
Q2. Imagine that after washing your hands, you leave ten bacteria cells on a new bar of soap. You then decide to do plate count of the soap after it was left in the soap dish for 24 hours. You dilute 1g of the soap 1:106 and plate it on standard plate count agar. After 24 hours of incubation, there are 168 colonies. How numerous bacteria were on the soap? How did they get there?
In an experiment you are studying a neuron that receives synaptic inputs from two other neurons: one from neuron A and one from neuron B. Illustrate a separate graph for each value of Vm.
How could you explain the occurrence of birth defects (caused by altered genes) in children and grandchildren of WWII atomic bomb victims, while the victims themselves were only mildly affected.
Blood glucose was monitored weekly for all mice. After five weeks, there was no change in average body weight between groups.
What factors establish the choice of a paper strip containing bacterial endospores or a sealed ampule containing an endospore suspension for testing heat-sterilization equipment.
The altered tRNA translates the UGA as tryptophan. What nucleotide varies has probably occurred in the mutant tRNA molecule? What consequences will the presence of such a mutant tRNA have for the translation of the normal genes in this cell.
Which pair will have been likely to agree that strata such as those depicted here were deposited gradually over long periods of time by subtle mechanisms that are still at work?
What specific effects might these toxins have on neuron function. How various plants of each of the four phenotypes do you expect.
A dihybrid cross of two plants is done and the seed pod shape is examined
What are genotypes of all the individuals mentioned in this difficulty. What is the point of the agar dish not treated with X-gal.
Monarch butterfly populations are found east and west of Rocky Mountains. How can DNA fingerprinting technology be used to establish that they constitute one breeding population or two separate breeding populations.
Why can prakaryotes quickly re infect a patient if they are not wiped out? How may this result in the evolution of drug resistant pathogens.
Based on the results of your investigation, what conclusions could you draw about the relationship between a muscle's workload and its threshold of stimulation.
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