Question

Anne has been observing human embryos in different stages. She wants to study the gastrula phase. How will she find it?

Answer 1

During the embryonic development we see different stages such as the zygote undergoes several cleavage divisions to form morula.

Step-by-step explanation:

Morula is a solid ball of cells. Morula then changes into blastocyst with a blastocoel within. It is the blastocyst stage which gets implanted into the uterine wall. Blastula then transforms into gastrula and the process is called gastrulation.

During gastrulation movement of cell in small masses or sheets occur resulting in the formation of germinal layers. Humans are triploblastic organisms thus three germinal layers are formed in gastrula stage. They are Ectoderm, endoderm and mesoderm. Amniotic cavity filled with amniotic fluid is also observed in the gastrula stage. A primitive streak with primitive node is also observed in gastrula.

Answer 2

Anne has been observing human embryos in different stages. She wants to study the gastrula phase by looking for the presence of the germ layers and the primitive gut in the embryo
hope this helps