Top Ten Reasons Why Your Ready for a Spring Break from Astro 330 10) It is officially Spring– vernal equinox is tomorrow. 9) You’re starting to enjoy seeing Frank Drake’s face on my slides. 8) I’m starting to make sense. 7) You talked to you friends about how closely proteins and nucleic acids are linked. 6) You sold your GPS and now navigate by the stars. 5) You celebrated Illinois Pluto Day on March 13th. 4) You can’t form a sentence without using the term “freaky big”. 3) You have subconsciously adopted a hairstyle matching Einstein’s. 2) You wake up in a cold sweat at night worrying about Supernovae. 1) You need to recover from the pneumonia you contracted while waiting for UFOs every night. Mar 19, 2009 Astronomy 330 Spring 2009 Astronomy 330 Music: Space Robot Five– Brave Saint Saturn Outline • Two types of cell life: Eukaryotes and Prokaryotes. • All life can be divided into 3 types: – Bacteria – Archaea – Eukarya • Genetic diversity of life… 0.4 life/ planet # of advanced civilizations we can contact in our Galaxy today Drake Equation N = R * ! f p ! n e ! f l ! f i ! f c ! L Star formation rate Fraction of stars with planets # of Earthlike planets per system Fraction on which life arises Fraction that evolve intelligence Fraction that commun- icate Lifetime of advanced civilizations Frank Drake 20 stars/ yr 0.12 systems/ star 1.25 x 0.12 = 0.15 planets/ system intel./ life comm./ intel. yrs/ comm. That’s 1.4 life systems/decade
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Top Ten Reasons Why Your Ready for a
Spring Break from Astro 330
10) It is officially Spring– vernal equinox is tomorrow.
9) You’re starting to enjoy seeing Frank Drake’s face on my slides.
8) I’m starting to make sense.
7) You talked to you friends about how closely proteins and nucleic acids are linked.
6) You sold your GPS and now navigate by the stars.
5) You celebrated Illinois Pluto Day on March 13th.
4) You can’t form a sentence without using the term “freaky big”.
3) You have subconsciously adopted a hairstyle matching Einstein’s.
2) You wake up in a cold sweat at night worrying about Supernovae.
1) You need to recover from the pneumonia you contracted while waiting for UFOs every night.
Mar 19, 2009 Astronomy 330 Spring 2009
Astronomy 330
Music: Space Robot Five– Brave Saint Saturn
Outline
•! Two types of cell life: Eukaryotes and Prokaryotes.
•! Sexual reproduction leads to greater genetic diversity– a difference between prokaryotes and eukaryotes?
•! Asexual reproduction does not allow 2 new and beneficial mutations to combine.
•! Blackberries have not changed much in 10 millions years, but sexual plants have produced: raspberries, thimbleberries, cloudberries, dewberries, etc.
•! Sex is useful in the process, but the mutations are still key.
http://www.alcasoft.com/arkansas/blackberry.html
Does it take a long time?
Cabbage, kale, kohlrabi, brussels sprouts, cauliflower and broccoli have same common ancestor– wild mustard. All bred by humans on a very short time scale.
Or domestic lap dogs from
wolves in about 5000 years.
This is
selective
breeding, but
still the
potential is in
the DNA.
Question
Sex in space, or on Earth, is important because
a)! sex, although fun, also stimulates gene
mutations.
b)! it allows the genetic material of the better
organisms to survive.
c)! mutations can only occur in sexual reproduction.
d)! it leads to greater genetic diversity and an
increase of positive mutations in the offspring.
Comparing Ages
•! Important to understand history of Earth life is the