The Ultimate Baby Picture
Fertilized human egg
Male and female genetic material (DNA)
is contained in the 2 pronuclei seen in the center.
(After its entry into the egg cytoplasm, the spermatozoal nucleus,
now called the male pronucleus, begins to swell, and its
chromosomal material disperses and becomes similar in
appearance to that of the female pronucleus.)
We've grown a bit since then ... so where did our
atoms come from?
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