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0628889
wrote...
4 years ago
i think its the different forms like the baby developing like the 3 steps .

please help Slight Smile
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3 Replies
wrote...
4 years ago
Yep. I am not sure of the exact time spans, but I know for sure that the zygote is the very first cell, that was fertilized by the sperm.
wrote...
4 years ago
A zygote (from Greek Neutral FaceNeutral Face? zug?tos "joined" or "yoked", from Neutral FaceNeutral Face zugoun "to join" or "to yoke")[1] is a cell that is the result of fertilization. That is, two haploid cells?usually an ovum from a female and a sperm cell from a male?merge into a single diploid cell called the zygote (or zygocyte). A zygote is the first cell of a new unique organism that has DNA from the mother and father.

A zygote begins as a fertilized egg (ovum), and contains all of the genetic information (DNA) necessary to become a baby; half of that information is from the mother?s egg and half from the father?s sperm that has fertilized the egg. The organism in the zygote stage of life travels down the fallopian tube, while dividing to form a larger group of cells.[2] This cell division is mitotic, and is known as "cleavage".[3] All mammals go through the life stage of being in the zygote stage of life. After this life stage the organism goes through the life stages of an embryo, and a fetus. A human zygote exists for about four days, and becomes a blastocyst on the fifth day.

An embryo (irregularly from Greek: Neutral FaceNeutral Face?, plural Neutral FaceNeutral Face, lit. "that which grows," from en- "in" + bryein "to swell, be full"; the proper Latinate form would be embryum) is a multicellular diploid eukaryote in its earliest stage of development, from the time of first cell division until birth, hatching, or germination. In humans, it is called an embryo from the moment of implantation until the end of the 8th week, whereafter it is instead called a fetus.

Fetus the stage of human development | other species | Fetus (biology) | ? A fetus (or foetus or f?tus) is a developing mammal or other ?
wrote...
4 years ago
simply put - yes the stages of development are zygote (from fertilization to day 5), embryo (to week 8) and then fetus (wk 8 to birth)
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