Friday, March 6, 2015

Which came first, the chicken or the egg?

Biology helps us decide which came first, the chicken or the egg.

Red jungle fowl mating pair.
Step One:   Take a male and female "red jungle fowl".

Female: notice slender legs and small breast

Male:  notice he is flying, unlike big, muscular chickens
Step Two:   Let's get busy!   Sexual reproduction creates an embryo with half the DNA from each jungle fowl.  This is now a complete set of DNA in a fertilized egg.  But, it's not a chicken yet.  The DNA of the sperm has to invade the nucleus of the jungle fowl egg.  Once that is done, then we have a complete set of DNA inside the nucleus, and the jungle fowl egg is now carrying a chicken nucleus.


Step Three:  Hatchling.  Now we have a chicken.    From the egg of a red jungle fowl.

What's up?
Step Four:  After several generations of inbreeding, they have legs and breasts too big to fly, and turn into albinos.

Step Five:   Call PETA!

So the answer to the question is?  The chicken came first, because it was inside a red jungle fowl egg.

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