Distinguish between the syncytial blastoderm stage and the cellular blastoderm stage in Drosophila embryogenesis.

Video transcript

Hi, everybody. Let's take a look at this practice problem together the stage during Drosophila embryo genesis in which the cleavage nuclei lie at the surface of the egg in a common side of plasm is called a pre sensational blasted ERM, be sensational blasted ERM see cellular blast, a term or D gas Trela. Note that all of our answer options are either gas Trela or a type of blast. A germ. And recall that these two terms are used in the beginning steps of Drosophila embryo genesis. So let's review those stages here on the screen. I have an image for us to reference step A we begin with the deployed zygote right after fertilization. Note the one nuclei in the cell step B, nine rounds of nuclear division occur. The cell is now called a census IUM which means a single cell with multiple nuclei. In steps see the nuclei migrate the periphery of the cell. The cell is now called a census official blast a term sensational because all of the nuclei are still within a common cytoplasm and blast a Durham. Since all the nuclei are in a single layer at the cell border further division, nuclear divisions take place at the periphery of the cell. Before we move on to step D here, cell membranes developed between each nuclei and this forms a single layer of cells over the embryo surface. The cell is now called a cellular blast. A term. The next stage which is not depicted on this image is called gas relation in gas relation. The development of the germ layers occurs. The embryo then undergoes further development until it eventually reaches adult stage. So what stage did we review? That was where the cleavage nuclei lie at the surface of the egg all within the same cytoplasm. It was the sensational blast a term. So the correct answer is b sensational blast a term. Alright, everyone, I hope you found this helpful and I'll see you soon for the next practice problem.