bukti baru menunjukkan , Boa constrictors dapat memiliki anakan tanpa kawin --T-REC-komunitas reptil-semarang--KSE-komunitas satwa eksotik

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bukti baru menunjukkan , Boa constrictors dapat memiliki anakan  tanpa kawin  

Dalam sebuah temuan dekade teori ilmiah tentang reproduksi reptil , para peneliti telah menemukan bahwa boa constrictors betina  dapat “squeeze out babies”  tanpa kawin . Lebih mencolok , temuan menunjukkan bahwa anakan  yang dihasilkan dari reproduksi aseksual ini telah sebelumnya diyakini tidak mungkin ....read more

Boa constrictors can have babies without
mating, new evidence shows

Date:

November 4, 2010

Source:

North Carolina State University

Summary:

In a finding that upends decades of scientific theory on reptile
reproduction, researchers have discovered that female boa constrictors can
squeeze out babies without mating. More strikingly, the finding shows that the
babies produced from this asexual reproduction have attributes previously
believed to be impossible.

...........................

In a finding that upends decades of scientific theory on reptile
reproduction, researchers at North Carolina State University have discovered
that female boa constrictors can squeeze out babies without mating.

More strikingly, the finding shows that the babies produced from this
asexual reproduction have attributes previously believed to be impossible.

Large litters of all-female babies produced by the "super mom"
boa constrictor show absolutely no male influence -- no genetic fingerprint
that a male was involved in the reproductive process. All the female babies
also retained their mother's rare recessive color mutation.

This is the first time asexual reproduction, known in the scientific world
as parthenogenesis, has been attributed to boa constrictors, says Dr. Warren Booth,
an NC State postdoctoral researcher in entomology and the lead author of a
paper describing the study. He adds that the results may force scientists to
re-examine reptile reproduction, especially among more primitive snake species
like boa constrictors.

The study is published online in Biology Letters, a Royal
Society journal.

Snake sex chromosomes are a bit different from those in mammals -- male
snakes' cells have two Z chromosomes, while female snakes' cells have a Z and a
W chromosome. Yet in the study, all the female babies produced by asexual
reproduction had WW chromosomes, a phenomenon Booth says had not been seen
before and was believed to be impossible. Only through complex manipulation in
lab settings could such WW females be produced -- and even then only in fish
and amphibians, Booth says.

Adding to the oddity is the fact that within two years, the same boa mother
produced not one, but two different snake broods of all-female, WW-chromosome
babies that had the mother's rare color mutation. One brood contained 12 babies
and the second contained 10 babies. And it wasn't because she lacked options:
Male snakes were present and courted the female before she gave birth to the
rare babies. And the versatile super-mom had previously had babies the
"old-fashioned way" by mating with a male well before her two asexual
reproduction experiences.

Booth doubts that the rare births were caused by environmental changes. He
notes that while environmental stresses have been associated with asexual
reproduction in some fish and other animals, no changes occurred in the mother
boa's environment or routine.

It's possible that this one snake is some sort of genetic freak of nature,
but Booth says that asexual reproduction in snakes could be more common than
people think.

"Reproducing both ways could be an evolutionary 'get-out-of-jail-free
card' for snakes," Booth says. "If suitable males are absent, why
waste those expensive eggs when you have the potential to put out some
half-clones of yourself? Then, when a suitable mate is available, revert back
to sexual reproduction."

A reptile keeper and snake breeder, Booth now owns one of the young females
from the study. When the all-female snake babies reach sexual maturity in a few
years, Booth will be interested to see if they mate with a male, produce babies
without a mate, or -- like their mother -- do both. In any case, these
WW-chromosomed females will continue their version of "girl power,"
as any baby they produce will also be female.

Drs. Coby Schal and Ed Vargo co-authored the paper. Co-author Sharon Moore
raised the snakes in the study. Co-author and veterinarian Daniel Johnson
provided surgical sex testing on the snakes. NC State's Department of
Entomology is part of the university's College of Agriculture and Life
Sciences.







Story Source:

The above story is based on materials provided by North
Carolina State University. Note: Materials may be edited
for content and length.







Journal Reference:

1.   
Warren Booth, Coby Schal, Edward L. Vargo Daniel H. Johnson and Sharon
Moore. Evidence for viable, non-clonal but fatherless Boa constrictors. Biololgy
Letters, November 3, 2010 DOI: 10.1098/rsbl.2010.0793

http://www.sciencedaily.com/releases/2010/11/101103111210.htm

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