Essential Question: From where did plans of body derive from?
All organisms have these features and the genetic systems that control the development of these features in even the most primitive animal do the same thing in our bodies. Humans are tetra-pods. Our bodies exist in three dimensions: the head on top, spinal cord toward our back, and guts on belly side. During the first few days after conception, the single cell that will eventually form a fully adult human divides several times. First into two cells, then four. Eventually forming a small, hollow ball of cells called a blastocyst. On the sixth day, the blastocyst embeds itself into the lining of the uterus.
Shubin also talks about the three layers that I learned last year in of blastocyst. Every animals is "hollow tube with three layers of cells in the tube walls. The hollow tube becomes the animal’s digestive system. Mouth at one end, anus at the other, and some number and variety of tubes in the middle."
Things that I found really interesting in this chapter are as said in many biology classes blastocyst doesn't grow to be a person. Zygote actually builds up to a organism. Well when I researched, I changed my mind whether a fetus is living or non living. I always said it was living but now I think of it is not living because until it is a certain weeks nothing really is developed or nothing is formed they are just like bunch of cells that would be a human. If you think long term you are killing a baby but at only zygote point I say "we have cells that die in our body all time, so what is the point?"
All organisms have these features and the genetic systems that control the development of these features in even the most primitive animal do the same thing in our bodies. Humans are tetra-pods. Our bodies exist in three dimensions: the head on top, spinal cord toward our back, and guts on belly side. During the first few days after conception, the single cell that will eventually form a fully adult human divides several times. First into two cells, then four. Eventually forming a small, hollow ball of cells called a blastocyst. On the sixth day, the blastocyst embeds itself into the lining of the uterus.
Shubin also talks about the three layers that I learned last year in of blastocyst. Every animals is "hollow tube with three layers of cells in the tube walls. The hollow tube becomes the animal’s digestive system. Mouth at one end, anus at the other, and some number and variety of tubes in the middle."
Things that I found really interesting in this chapter are as said in many biology classes blastocyst doesn't grow to be a person. Zygote actually builds up to a organism. Well when I researched, I changed my mind whether a fetus is living or non living. I always said it was living but now I think of it is not living because until it is a certain weeks nothing really is developed or nothing is formed they are just like bunch of cells that would be a human. If you think long term you are killing a baby but at only zygote point I say "we have cells that die in our body all time, so what is the point?"
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