Question

What is the correct lineage of a zygote?

• A. Zygote -> Blastomere -> Morula -> Blastocyst
• B. Zygote -> Blastula -> Morula -> Blastocyst
• C. Zygote -> Morula -> Blastomere -> Blastula
• D. Zygote -> Blastocyst -> Blastula -> Blastomere

Answer 1

Answer:

A. Zygote -> Blastomere -> Morula -> Blastocyst

Zygote undergoes rapid cleavage to form 2, 4, 6, and then 8 blastomeres. They undergo few more rounds of division to form morula. Cells divide further to form a hollow ball called a blastula. This is followed by minor differentiation of cells to produce a blastocyst.