Puzzle Description:

Meiosis, showing "crossing over" on the left when DNA is exchanged between chromosomes, and the resultant division into 4 gamete cells, each having different genetic code for the same organism.

#1: Teresa K (fasstar) on May 26, 2010 [SPOILER]

Meiosis, a critical process in sexual reproduction, is thought to have occurred for the first time around 1.4 billion years ago. The first cells to reproduce this way were protists, a group of Eukaryotes, cells that have DNA enclosed in a nucleus. These first appeared in the Proterozoic Era. During the next billion years, life remained fairly primitive, and the distinctions between plants and animals were not very clear-cut.

This video is the best online lesson I found that explains mitosis, meiosis, and sexual reproduction of cells:
http://www.youtube.com/watch?v=D1_-mQS_FZ0&feature=related

Another great lesson Teresa and a nice colourful puzzle to solve!

Thanks Teresa. Ditto to #3

Teresa, I rather do IT the old fashion way :D

Thanks, Susan and Jewel.

Tom, this is about as old-fashioned as you can get. Those little gametes on the right could be sperm or ova. The meiosis was the process of creating those sperm and ova. :-)

Fascinating and fun to solve!

Thanks, Linda.

Oh my gosh, teresa! You are amazing. Take a biology lesson and turn it into a puzzle. Thank you, Thank you, Thank you.

I'm having fun learning all this for the first time too. A lot of the research on this was done since my school years.

Here's a shorter video (less than two minutes) for those who don't want to sit through the longer lesson.

http://www.youtube.com/watch?v=D1_-mQS_FZ0

That wasn't hard, but it was fun to solve. I knew what it was as soon as I saw the rounded edge of the cell on the left with the strand of DNA. Great idea for a puzzle!

Thanks, Liz.

WOW!! FanTASTic image, lesson, story, and a fun and colorful solve.

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