Chromosomal Disharmony Leads to the Formation of a New Species

furball4paws

[furball4paws]

In 1927, Karpechenko made a hybrid of the common radish, Raphanus sativus, and cabbage, Brassica oleracea. Each parent has a diploid chromosome number of 2N=18. The hybrid also had 18 chromosomes, but because normal sperm and eggs could not be formed, the hybrid was sterile, as is common in such cases.

However, some of the "sterile" hybrids produced a few viable seeds. These seeds were produced when the chromosome number spontaneously doubled. The doubling permitted the pairing of partner chromosomes and the formation of gametes with 1N=18.

Karpechenko witnessed the birth of a new species in the passage of only 3 plant generations. He named the new species Raphanobrassica. It was fully fertile and could not cross with either parent. Unfortunately, the new species had the root of a cabbage and the leaf of a radish, and therefore had no commercial value.

This process of autopolyploidy is responsible for many commercial crop plants (tobacco, for one). It is estimated by botanists that 25-50% of existing plant species arose through a mechanism of autopolyploidy.

References. 1. Niklas, KJ. 1997, The Evolutionary Biology of Plants. University of Chicago Press 2. Karpechenko, GD. 1927. Polyploid hybrids of Raphanus sativus X Brassica oleracea. Zeit. Ind. Abst. Vererbungslehre 48:1-58.

[PatrickHenry]

Evolution Ping The List-O-Links

A conservative, pro-evolution science list, now with over 350 names. See the list's explanation, then FReepmail to be added or dropped. To assist beginners: But it's "just a theory", Evo-Troll's Toolkit, and How to argue against a scientific theory.

[PatrickHenry]

I'm an idiot. I didn't realize this thread was an old one. You just linked to it here.

And I figured ... well ... sorry folks! False ping.

[VadeRetro]

Another "For Dummies" resource on polyploidy.

Speciation by Polyploidy.

Filed under Speciation: Can New Species Arise?

[VadeRetro]

Let's see now. As a creationoid, I would be more impressed by (1) The re-animation of a DEAD person/animal or (2) The creation of life from some soup (primordial or otherwise). Just because you don't believe in God doesn't mean He doesn't exist. One day one of us will be proven wrong.

Neither of the things you would be more impressed by have much to do with whether common descent is true.

[Vaquero]

I'm waiting for the viable mule of Heinlein's creation from "Time Enough for Love"

[Vaquero]

“God shmod! I want my monkey-man!”

[ml1954]

But corn still produces corn!!! HAHAHAHA!!! </YEC lunatic mode>

[Rudder]

Unfortunately, the new species had the root of a cabbage and the leaf of a radish, and therefore had no commercial value.

If that's all evolution can do then the hell with it. We should have a committee formed to arrive at a consensus about what type of species we want.

[jennyp]

And I figured ... well ... sorry folks! False ping.

1-year-anniversary-but-it's-still-just-a-plant PING.

[Rudder]

Re: your tag line:

Next do the APA style manual.

You know...just for laughs.

[b_sharp]

". I have not heard of them bringing a dead person back to life that has been in the grave for three days though."

Are you suggesting evolution prove itself to be God? (I refer back to your original 'abiogenesis' post)

[CarolinaGuitarman]

" I have not heard of them bringing a dead person back to life that has been in the grave for three days though."

Jesus wasn't dead for three whole days before the resurrection. He died Friday afternoon, and was resurrected by Sunday morning. That's about a day and a half.

[furball4paws]

I link to this thread periodically when the 'oids complain we can't make a new species in the lab. How you found and thought it was a ping is beyond me.

[PatrickHenry]

It was a wardrobe malfunction.

[PatrickHenry]

It's interesting -- to me anyway -- to compare the evolution of the ping list logo. Post #12 has the ping I made in this thread almost exactly one year ago, which is reproduced here:

EvolutionPing

A pro-evolution science list with over 240 names. See list's description at my homepage. FReepmail to be added/dropped.

We then had somewhat over 240 names, which I thought was a lot. The latest (erroneously posted) version of the logo is at post #41, but reproduced here:

Evolution Ping The List-O-Links

A conservative, pro-evolution science list, now with over 350 names. See the list's explanation, then FReepmail to be added or dropped. To assist beginners: But it's "just a theory", Evo-Troll's Toolkit, and How to argue against a scientific theory.

We now have over 350 names, so we've gained 110 in a year. Verily, evolution is on its last legs.

[CarolinaGuitarman]

"It's interesting -- to me anyway -- to compare the evolution of the ping list logo."

It's still a ping list. I'll be impressed when it grows wings and becomes a bird.

[jennyp]

Next do the APA style manual.

You know...just for laughs.

I dunno, I think it'd be a big comedown. :-)

[PatrickHenry]

I'll be impressed when it grows wings and becomes a bird.

I'm working on it.

[longshadow]

We now have over 350 names, so we've gained 110 in a year.

Do you realize, that's a growth rate of over 45% per year?

Clearly, this means the pro-evo side on FR is dwindling badly, and could disappear completely in the next few months.

< /Luddite Logic mode>

[longshadow]

BTW, when the ping list "shrinks" up to 400, does the GrandMaster plan to hold the usual DarwinCentral™-sponsored Human Sacrifice and Three-Day Debauchery, or will he really let his hair down and celebrate this time?