Question

An embryo with meroblastic cleavage, extraembryonic membranes, and a primitive streak must be that of ______. A. an insect B. an amphibian C. a bird D. a sea urchin

Answer 1

An embryo with meroblastic cleavage, extraembryonic membranes, and a primitive streak must be that of a option(c)i.e, bird.

Mesoderm is produced by the primitive streak, and it eventually becomes mesenchyme (embryonic connective tissue). Around growing organs, mesenchyme develops into a packing tissue before becoming connective tissues and muscles. With birds, we start to witness the embryos develop in a meroblastic manner, with a lot more yolk than usual. Cell mobility is also unusual because the cells in birds lie more in sheets than in balls.

A longitudinal thickening of cells along the blastoderm of large-yolked eggs forms the primitive streak during ingression, through which potential chordamesoderm and mesoderm cells move inward. Cells of the hypoblast are replaced by endodermal cells. Through ingression, the embryo develops longer and fills more of the region pellucida, lengthening the original stripe over the surface of the yolk. Following gastrulation, the neural tube and its supporting components are formed during the process of neurulation.

Learn more about primitive streak here: brainly.com/question/13153357

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