What term describes a solid ball of cells formed after fertilization?

What term describes a solid ball of cells formed after fertilization?

• A. Zygote
• B. Morula
• C. Blastocyst
• D. Embryo

Answer: (B)

When the egg is fertilized, the single cell starts dividing rapidly in a process called cleavage. After several divisions, the cells form a compact solid ball with no internal cavity—the morula. This stage sits between the initial zygote and the hollow-stage blastocyst, which develops a fluid-filled cavity, and before the embryo stage, which refers to the developing organism after implantation. So, a solid ball of cells formed after fertilization is the morula.

When the egg is fertilized, the single cell starts dividing rapidly in a process called cleavage. After several divisions, the cells form a compact solid ball with no internal cavity—the morula. This stage sits between the initial zygote and the hollow-stage blastocyst, which develops a fluid-filled cavity, and before the embryo stage, which refers to the developing organism after implantation. So, a solid ball of cells formed after fertilization is the morula.