Which one of the following is a correct developmental sequence?

  • 1

     Ovum-sperm, blastocyst, zygote.

  • 2

     Blastocyst, ovum-sperm, zygote.

  • 3

    Blastocyst, zygote, ovum-sperm.

  • 4

    Ovum-sperm, zygote, blastocyst

Answer:- 4
Explanation:-

The fertilised egg (zygote) divided repeatedly and moves down the fallopian tube to the uterus. Between 5 and 8 days after fertilisation, the blastocyst attaches to the lining of the uterus, usually near the top.

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