In protostomes [Select] cleavage occurs and it is [ Select ] In addition, in protostomes th v [ Select ] determinate develops from the blastopore. radial anus spiral indeterminate mouth

Select all the features of meiosis that are true.

What type of gamete is produced by an antheridial head? By an archegonial head? Edit View Insert Format Tools Table 12pt v Paragraph BIU O words 4-...pdf MacBook Pro

Fluorescence Mapping of Blastomere in Sea Urchins Fate mapping is a technique that allows determination of the fate of cells from the three germ layers. In worms, the endoderm gives rise to the cells that line the intestines. The ectoderm gives rise to cells of the nervous system and body covering. The mesoderm gives rise to the muscles and other organs between the ectoderm and mesoderm. A researcher is tracing the fate of a particular cell (blastomere) from its position in one of the three germ layers of sea urchin blastulae by injecting a fluorescent tag in cells of the ectoderm, mesoderm, and endoderm. Several weeks later, the sea urchin embryos were analyzed for the presence of fluorescence in specific tissues. The following results were obtained. Tissue  Percent increase fluorescence over background when dye is injected in the ectoderm  Percent increase fluorescence over background when dye is injected in the mesoderm Percent increase fluorescence over background when dye is…