A researcher working with fruit fly embryos removes the cells containing the pole plasm at the posterior end of an embryo.In a second embryo, the researcher removes several cells just lateral to the ones containing pole plasm.If both embryos develop into larvae, it is most likely that
A) the first larva will have gonads that lack germ cells, and the second larva will have gonads that contain germ cells.
B) the first larva will lack gonads and germ cells, and the second larva will lack germ cells.
C) both larvae will contain germ cells but no gonads.
D) both larvae will contain gonads but no germ cells.
E) both larvae will be able to regulate and form normal larvae.

Question

Quizplus · Accepted Answer

The removal of cells containing pole plasm at the posterior end of an embryo will result in a lack of germ cells in the gonads of the first larva. The pole plasm is necessary for germ cell formation. In the second embryo, the removal of cells just lateral to the ones containing pole plasm will not affect the formation of germ cells, so the second larva will have gonads that contain germ cells.

A Researcher Working with Fruit Fly Embryos Removes the Cells