Sex, cleaner of genomes

Indiana University via biologynews.net ^ | February 16, 2006 | NA

[Jeff Chandler]

In mammals, sex is usually preceded by intricate mating behaviors.

Indeed.

[Pontiac]

This family tree reveals that sexual populations have recently and repeatedly spun off asexual strains.

I would think that some environmental stress would cause the spin off of an asexual strain. Perhaps a die off of prey or a particularly cold year.

[Diva]

"Ultimately, we would like to know how long a species can abstain from sex without going extinct,"

Doh! :-O

[ninonitti]

sex appears to have enabled the separation of beneficial and deleterious versions of genes

Is this where can I get me one of those sex licenses?

[BooksForTheRight.com]

“When sexual species reproduce asexually, they accumulate bad mutations at an increased rate”
Take note. CLONING is reproducing asexually, so CLONING will cause big trouble with abnormal mutations.

[the invisib1e hand]

Guilty.

[Sherman Logan]

Sex ... is ... costly and at times complicated.

No kidding.

[norwaypinesavage]

"Scientists have long been left to ponder, what is it about sex that justifies its big energy investment?"

Doesn't have a clue, does he? And people wonder why scientists are considered to be nerds.

[hellbender]

The scientists sequenced the entire mitochondrial genomes...and...found the asexual lines have accumulated bad mutations four times faster than sexual lines.

This is confusing. At least in humans, mitochondrial DNA is supposed to be asexually reproduced, coming only from the mother. Is that not the case with water fleas?

[SampleMan]

Sexual reproduction is biologically costly and at times complicated. In mammals, sex is usually preceded by intricate mating behaviors. It requires the compatibility of sexual structures, an insertion event,...

New recommended pick up line, "Want to take part in an insertion event?"

[Ghengis]

"Scientists have long been left to ponder, what is it about sex that justifies its big energy investment?"

Doesn't have a clue, does he? And people wonder why scientists are considered to be nerds.

Chantilly Lace had a pretty face and a ponytail hangin' down
A wiggle in her walk and a giggle in her talk
Make the world go 'round
Ain't nothing in the world like a big eyed girl
To make me act so funny, make me spend my money
Make me feel real loose like a long necked goose
Like a--oh baby, that's a-what I like!

[fieldmarshaldj]

Don’t forget smelly.

[SunkenCiv]

Thanks neverdem for both of these.

Chromosome rearrangements not as random as believed
Children’s Hospital of Philadelphia via biologynews.net | February 16, 2006 | NA
Posted on 06/22/2008 3:02:05 AM PDT by neverdem
http://www.freerepublic.com/focus/f-news/2034639/posts

[SunkenCiv]

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[martin_fierro]

The researchers used the model species Daphnia pulex

Ah, good ol' Daphne Pulex.

Good times. Good times.

[djf]

Sex, cleaner of genes???

I know a gal whose jeans I’d like to...
ummm... do some bioengineering with.

[SunkenCiv]

She was dating both of us at the time, though...

[668 - Neighbor of the Beast]

Even ugly water fleas
Do it

[668 - Neighbor of the Beast]

The ability to reproduce asexually may be useful to organisms that can't get mates, but its long-term benefits are questionable.

If I sit here long enough, I'll double in size?