Which statement about early development in vertebrates is true?
A) Failure of the neural folds to fuse in the anterior region of the developing neural tube results in anencephaly.
B) Gastrulation follows organogenesis.
C) The notochord is formed from neural ectoderm and provides structural support to the developing embryo.
D) Neural crest cells form the neural tube.
E) Failure of the neural folds to fuse in the posterior region of the developing neural tube is often linked to a deficiency in vitamin D.

Question

Quizplus · Accepted Answer

Failure of the neural folds to fuse in the anterior region of the developing neural tube results in anencephaly, which is a serious neural tube defect characterized by incomplete development of the brain and cranial vault.

Answer: B
 Gastrulation is a process that occurs before organogenesis in which the blastula is transformed into a three-layered embryo called the gastrula.

Answer: C
 The notochord is formed from mesoderm and provides structural support to the developing embryo. It also plays a role in inducing the formation of the neural tube.

Answer: D
 Neural crest cells are a population of cells that arise from the neural tube and migrate to different parts of the embryo, where they differentiate into various cell types, such as neurons and glia, pigment cells, and cartilage.

Answer: E
 Failure of the neural folds to fuse in the posterior region of the developing neural tube is often linked to spina bifida, another serious neural tube defect; vitamin D deficiency is not a known cause of this condition.

Which Statement About Early Development in Vertebrates Is True