In a fruit fly embryo, a homeotic gene Antp determines where legs grow. When the promoter of Antp is mutated, a fly ends up with legs growing out of its head in place of antennae. In this mutation
A. antennae grow where the legs would normally be found.
B. Antp must be turned off in all of the fly cells.
C. Antp must be turned on in the head.
D. the Antp gene, and its transcription factor, and enhancer sequence are turned on in the head.
E. the Antp enhancer sequence, or transcription factor, is not functional.
C. Antp must be turned on in the head.
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Each of the following are steps in the receptor kinase signaling pathway EXCEPT ____
a. a signal molecule binds to a membrane receptor protein b. protein kinase is activated c. GTP donates a phosphate group to an inactive protein kinase d. a specific protein is activated via phosphorylation e. a cellular response is initiated
In which of the following organisms is
genetically engineered human insulin produced?
a. pigs b. E. coli c. humans d. T. aquaticus e. B. thurigiensis
Choose the one best answer for each numbered item.
A. Gray crescent B. Gastrulation C. Fertilization D. E. Differentiation F. Cleavage G. Animal pole H. Gastrula I. J. Embryonic induction K. L. Apoptosis
A heterozygote could have a variety of phenotypes depending on whether or not the mutation is recessive, dominant, or haploinsufficient. In this example, the gene A is necessary to form a tail in mice. If the mouse is a heterozygote (A/a), then what
would you predict the phenotype to be if the mutation was recessive, dominant, or haploinsufficient. What will be an ideal response?