In rats, the P gene allele for pigmentation (P) is dominant to the allele for albinism (p). The B gene allele for black pigmentation (B) is dominant to the allele for cream pigmentation (b). The pp homozygous recessive genotype is epistatic to any allele combination at gene B. Predict the genotypes and phenotypes of the F1 progeny of a cross between a pure-breeding black rat and an albino that is also homozygous for cream.
A) PP BB, black
B) Pp Bb, black
C) Pp Bb, albino
D) pp Bb, albino
B) Pp Bb, black
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a. paper clip b. ladder c. fork d. rope e. coiled spring
A population of deer is sampled. 25 deer are caught and tagged. Two months later, the researchers return and find that
4 of the 16 deer they observe have tags. This would suggest a total population size of what number? Explain your answer. What will be an ideal response?
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A. Epithelial B. Muscle C. Nerve D. Supportive E. Connective
Cholera enterotoxin causes ________, which is the primary way infected individuals die from the disease
a. extremely high fever b. diarrhea and dehydration c. hemolysis of the intestinal tract cells d. sepsis