Formation of germ cells in Drosophila and many other embryos is dependent on their position in the embryo and their exposure to localized cytoplasmic determinants. Nuclei exposed to cytoplasm in the posterior end of Drosophila eggs (the pole plasm) form cells that develop into germ cells under the direction of maternally derived components. R. Amikura et al. [(2001). Proc. Nat. Acad. Sci. (USA) 98:9133–9138] consistently found mitochondria-type ribosomes outside mitochondria in the germ plasma of Drosophila embryos and postulated that they are intimately related to germ-cell specification. If you were studying this phenomenon, what would you want to know about the activity of these ribosomes?

Hi, everybody. Let's take a look at this practice problem together. In which part of the Drosophila embryo? Do the germ cells form? Remember what germ cells are and they are embryonic cells and they can develop into gametes in adult Drosophila. Now recall that the germ cells develop from pole cells. So where in the Drosophila embryo are these pole cells located? Is it a anterior pole b, posterior pole see middle region or d all of the above. So the correct answer is option B, posterior pole, the pole cells are located here and they eventually give rise to the germ cells. So again, the answer is option B. Alright, everyone I hope you found this helpful and I'll see you soon for the next practice problem.