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wisp

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Females of XY-XX species (XY males determines the sex of the offspring, and have the heterogeneous chromosome) have a different criterion for choosing males than ZW-ZZ species, like birds (ZW females determine the sex of the offspring, and have the heterogeneous chromosome).  VERY INTERESTING!!!!

http://www.sciencedaily.com/releases/2005/10/051009201943.htm

Evolution is an awesome tool.

Just by assuming it's true, and a little imagination, you can neatly explain lots of things.

Yes. Assumption.
Yes. Imagination.

But it it doesn't fit, we discard it and learn.



-------
Quote from Lester10 at 2:51 PM on September 21, 2010 in the thread
Scientists assert (by Lester):

Ha Ha. (...) I've told you people endlessly about my evidence but you don't want to show me yours - you just assert.
porkchop
Would we see a mammal by the water's edge "suddenly" start breathing underwater(w/camera effect of course)?
Contact me at youdebate.1wr@gishpuppy.com
 


Posts: 3037 | Posted: 5:31 PM on May 2, 2009 | IP
wisp

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I learned yesterday that the chromosome Y doesn't combine.

Shamefully, i didn't know what seems to be a basic knowledge.

But i think i've deducted the reason for the small size of Y.

The recombination of genetic sequences is a great advantage.
True, it can make good mutations disappear (basically because of dilution after a series of recombination with other individuals that lack the same mutation, specially in large populations), but it's highly effective at getting rid of harmful mutations.

Y, having lost the ability to recombine, is at a great disadvantage.

It has now just two ways of getting rid of a bad mutation:
1) Deactivation.
2) Deletion.

That's why it gets smaller over time.

Over more than 6k years, i'd say.

Y has lost the instructions that allow the eye to see red and green, so it depends on X getting it right. If X has a specific mutation, you get colorblind males.

If females have a bad mutation in some of the 2 Xs, the other one takes care of the function.

In birds the heterosomething (was it heterozygous?) chromosome (W) determines females. My guess is that females carry this disadvantageous trait. Meaning that W is smaller than Z.

This is stupid. An intelligent designer should make a random determination of sex. Or make it depend on some external factor like the temperature. Or let the females decide the sex of the offspring (or at least have a specific sexual pair of chromosomes with no other function).

You'd think that such a thing would give the Chinese only males, since they seem to love males.
But my guess is that male chauvinism wouldn't even appear in a species whose females can determine the sex of the offspring (that would always tend to be 50%, according to another of my guesses).

What i don't get is why birds have a different system. An inverted mechanism of sex determination.

I don't get it because our common ancestor must have had sex determination.

My guess is that sexual chromosomes can change over time.
Some mutation gives another chromosome the ability to improve some sexual trait in males or females, and the function of sex determination slowly switches from the original chromosome to a different one.

I don't like my own explanation. It looks desperate. But it's the only thing i can come up with that makes sense in my mind.

Perhaps someone could correct me if i'm wrong.



-------
Quote from Lester10 at 2:51 PM on September 21, 2010 in the thread
Scientists assert (by Lester):

Ha Ha. (...) I've told you people endlessly about my evidence but you don't want to show me yours - you just assert.
porkchop
Would we see a mammal by the water's edge "suddenly" start breathing underwater(w/camera effect of course)?
Contact me at youdebate.1wr@gishpuppy.com
 


Posts: 3037 | Posted: 9:00 PM on May 2, 2009 | IP
wisp

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Here's my humble moment:
This i don't get, must have been figured out by the people who know.

But this i don't get could be used by a creationist as an attack on Evolution.

To me it's incredibly arrogant (or is it just self confidence?) to sit around, maybe read some quotes, and think that you've really just farted the proof against Evolution.

That thousands of smart people who have dedicated their lives to biology, or geology, or anthropology, or whatever branch of science that contradict the Bible, missed something elemental that made them get all wrong.

-I don't know much about Evolution or thermodynamics... Didn't it say that things get worn down? Then Evolution is impossible!
Things growing in complexity... Sounds like magic. That's not possible, so the origin of life must have been... I don't know... MAGIC!


(Edited by wisp 5/2/2009 at 10:19 PM).


-------
Quote from Lester10 at 2:51 PM on September 21, 2010 in the thread
Scientists assert (by Lester):

Ha Ha. (...) I've told you people endlessly about my evidence but you don't want to show me yours - you just assert.
porkchop
Would we see a mammal by the water's edge "suddenly" start breathing underwater(w/camera effect of course)?
Contact me at youdebate.1wr@gishpuppy.com
 


Posts: 3037 | Posted: 9:31 PM on May 2, 2009 | IP
    
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