Early embryology; chromosome count correction!

I'd love some Darwinist explain this phenomenon to me. How did evolution add this protective mechanism to embryoes that are in the 3 to 5 day range of development? How does natural selection operate in this situation? -http://www.sciencedaily.com/releases/2011/07/110705071546.htm

Complete thread:

Early embryology; chromosome count correction! David Turell 2011-08-27, 01:37 AM
- Early embryology; chromosome count correction! xeno6696 2011-08-29, 02:45 AM
  - Early embryology; chromosome count correction! David Turell 2011-08-29, 12:43 PM
    - Early embryology; clockwork construction plan David Turell 2011-10-15, 01:59 PM
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        Early embryology; clockwork construction plan dhw 2011-10-17, 10:28 AM
        
        Early embryology; clockwork construction plan David Turell 2011-10-17, 02:35 PM
        
        Early embryology; clockwork construction plan dhw 2011-10-18, 01:36 PM
        
        Early embryology; clockwork construction plan David Turell 2011-10-18, 02:38 PM
        
        Early embryology; clockwork construction plan dhw 2011-10-19, 11:32 AM
        
        Early embryology; clockwork construction plan David Turell 2011-10-19, 03:06 PM
        
        Early embryology; clockwork construction plan dhw 2011-10-20, 02:53 PM
        
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Early embryology; chromosome count correction! (Introduction)