Correct sequence in development is
Fertilization – Zygote – cleavage – Morula – Blastula - Gastrula
Fertilization – Zygote – Blastula – Morula – Cleavage - Gastrula
Fertilization – Cleavage – Morula – Zygote – Blastula – Gastrula
Cleavage – Zygote – Fertilization – Morula – Blastula - Gastrula