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Coat color in mice is determined by two independently assorting but interacting genes. The dominant allele at the Black locus (B) results in a black pigment being deposited in the fur; the recessive allele (b) leads to no pigment being made and an albino phenotype. The dominant allele (A) at the other locus, Agouti, results in a wild type or ‘agouti' pigment pattern; the recessive allele (a) results in only the black pigment being seen. The bb phenotype is epistatic to the A- phenotype. In a testcross of Aa Bb mice X aa bb mice, what fraction of the progeny would have albino fur?
A. 1/4B. 1/2C. 3/16D. 3/4E. 9/16
In pea plants, allele for purple flowers (P) is dominant to the allele for white flowers (p). In a cross between the purple-flowered plant and the white-flowered plant, all 73 of the offspring plants had purple flowers. Which of the most likely descr..
Two parallel plates, separated by 0.20 m, are connected to a 12-V battery. An electron released 3) from rest at a location 0.10 m from the negative plate. When the electron arrives at a distance 0.050 m from the positive plate, what is the potenti..
Draw a diagram that traces the movement of a secreted protein from its site of synthesis to the outside of a eukaryotic cell. Identify all of the organelles that the protein passes through, & indicate the direction of movement.
What is the difference between an intermediate host and a definitive host? Identify each host in the life cycle of the causative agent of malaria?
Which of the following is TRUE about enzymes?
Think about a virus with a plus strand RNA genome 8 kb in length, which encodes eight proteins. Determine which of the following is a known mechanism for producing all eight proteins from this genome?
In the movie, Lost in Space, spider-like creatures attacked members of the Robinson family as they explored an abandoned spaceship. Maureen (the mom) scans the creatures and reports that the spiders are silicon-based life-forms.
In the presence of high intracellular concentrations of tryptophan, only short transcripts of the trp operon are synthesized because of attenuation of transcription 5' to the structural genes.
As a biologist it is your job to look for plants that have evolved structures with a selective advantage in dry hot conditions. Which of the adaptions would be least likely to meet the objective.
Describing how the brain transmits the message to muscles. Trace impulse, list the steps in as much detail as possible, from which your brain transmits the message to the suitable muscles in order to step up one step.
Explain what happens during each of the three main processes involved in the production of urine, namely filtration, reabsorption, and secretion.
Describe why gram-negative bacteria are more resistant to biocides than gram-positive bacteria. Be exact and descriptive in the response. A description of the differences between gram-negative and gram-positive bacteria must be included, along with a..
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