The miracle of the cell - part 2
The miracle of the design in the cell 1
The sperm's 23 chromosomes stretch out in the roomy, welcoming egg. Thechromosomes of sperm and egg approach each other and then the celldivides.
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On rare occasions, the tiny cluster of cells splits into two groups andcreates two embryos—identical twins. But most of the time the cells sticktogether. They must complete just the right number of cell divisions beforethey arrive in the uterus about five days after fertilization. What started asa large single cell has divided into just over a hundred much smaller cells,but they're still trapped within the hard shell of the zona.
The Miracle Of Creation In Plants | Golden Age
SRY turns on for a day or two, and the cells churn out its protein. But inthat short time, SRY sets off a chemical chain reaction, turning on othergenes, eventually turning the gonads into testicles, which begin to maketestosterone. Testosterone travels throughout the body. If it reaches thegenitals then the cells here will build a penis.
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Of course there is one way to tell the difference: look at the chromosomes ina cell from the embryo. One pair among the 23 determines sex. An embryo withtwo X chromosomes usually becomes a girl. If one of those Xs is a Y, it willmost likely be a boy.
(For detailed information see Harun Yahya, The Miracle in the Cell.)
Chemicals in one cell can trigger a reaction in the cell next door that canspread to the cell's nucleus and turn genes on or off. But what's really goingon in there? How does a gene get turned on?