Making a Person: From Zygote to Q Model 1: Earliest Stages of Embryogenesis Ga D

Question

Making a Person: From Zygote to Q Model 1: Earliest Stages of Embryogenesis Ga Day4 ona Day 5 morula pellucida cell mass 8 cell sta 4 cell stage 2 cell stage cleavage early blastocyst avage fallopian tube st myometrium zation zona pellucida (surrounding oocyte oocyte endometrium bypoblast Lumen of uterus Critical Thinking Questions rom the 1. According to the model, what is the name of the fertilization of the egg by the sperm? a. What is the name of the process that produces t What stage occurs after the first cleavage? After the a. Based on your answers above, what does the term this cell 2. 'mean in this case? PO

Explanation / Answer

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1.Ans-
The name of the cell that results from the fertilization of the egg by the sperm is called zygote. A zygote is a diploid cell that produces by fusion of male and female gametes.
a.Ans-
A zygote is produced by fusion of a sperm and an egg by the process of fertilization.
2. Ans-
The first cleavage occurs around 30 hours after the process of fertilization and produces two-celled blastomeres.
Within 40 hours, the second cleavage occurs after fertilization and four cell blastomeres.
a.Ans-
The cleavage is the process of division of zygote to produce a blastula.
3.Ans- On day four, the pre-embryo becomes a solid ball of 12 or more cells in a zona pellucida called a morula.
4.Ans-
On day 5, the early blastocyst hatches from the zona pellucid.

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