Question

(a) Describe the different stages of development a fertilised ovum in a
human female undergoes up to the blastocyst stage.
(b)
Name the parts of a blastocyst and write the fate of these parts till
the onset of pregnancy.
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Answer 1

Answer:

Carnegie Stage Table

StageDays (approx)Events45 - 6attaching blastocyst57 - 12 (week 2)implantation613 - 15extraembryonic mesoderm, primitive streak, gastrulation715 - 17 (week 3)gastrulation, notochordal process