Which phenotypes are parental?
In Drosophila, the autosomal recessive pr and cn mutations cause brown and bright-red eyes, respectively (wild-type flies have brick-red eyes). Flies who are homozygous recessive at both pr and cn have orange eyes. A female who has wild-type eyes is crossed to an orange-eyed male. Their progeny have the following distribution of eye colors:
A) wild-type and orange
B) brown and bright-red
C) wild-type and brown
D) bright-red and orange
E) There is no way to determine this.
B) brown and bright-red
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Which of the following statements regarding fecal transplant is correct?
A. The goal is to completely eradicate Clostridium difficile from a patient's gut microbiota and replace it with a healthy community. B. Fecal matter must be carefully disinfected and screened for viruses, cysts, and endospores before transfer to a recipient patient. C. Donors and recipients must be carefully matched to prevent an immune reaction in the recipient. D. This treatment is designed to jump-start the intestinal microbiota after an infection with Clostridium difficile resuts in acute diarrhea.
Genes located in cells in different regions of
the body during embryonic development may a. be turned on and off. b. never be turned on. c. be turned on and left on. d. be activated for only a short time in one cell and a long time in another cell. e. do all of these
Which statement is NOT correct about the lac operon?
A. It regulates the production of a series of five enzymes. B. It is normally turned off if glucose is present. C. It is an inducible system. D. The structural genes make products that allow lactose metabolism. E. Lactose binds to the repressor protein and inactivates it.
The flower color trait in radishes is an example of which of the following?
A) A multiple allelic system B) Sex linkage C) Codominance D) Incomplete dominance E) Epistasis