Reptile & Amphibian Forums

Hi Everyone - voice from the past here .

Last year at Daytona I purchased an adult male pinstripe from BHB. This year he dutifully produced 11 pins from four different females - Pretty normal, right?

Until you consider - EVERY pin was a FEMALE. This is like flipping a coin 11 times straight and having it come up heads. If my math is correct this will happen .0002441% of the time.

No bad eggs in any of the clutches and yes, some normals were male.

Thoughts?

Christy

I don't think your math is correct actually but close, I believe it should be 0.000488%, looks like you did 12 coin flips, but either way it is very unlikely for you to get 11 female pins, what was the total number of offspring of the four clutches and what was the male/female of the normals, so you didn't have any bad eggs but maybe some males didn't even make it to the point of being a laid eggs, maybe there is some likage or lethality to sex with your particular pins genes, while we simplify all these visual morph genes in terms of simple mendelian genetics in reality the genetics may not always be that simple. Maybe it just has to do with the sperm that individual male produced, thats why it would be interesting if you had high females in the normals too. This could be a possibility since I believe boidae are generally know to be heterogametic in females (ZW) and homogametic (ZZ) in males, so maybe he produced more (W) sperm for whatever reason. Just ideas I'm not saying they are right.
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Jeff Benfer

1.0 pastel Python regius
1.1 mojave Python regius
0.1 normal Python regius
1.3 Terrapene carolina thriunguis
2.3 Terrapene carolina carolina
4.1 Kinosternon baurii
1.1 Malaclemys terrapin terrapin
2.2 double het albino and anerythristicThamnophis sirtalis parietalis
1.0 anerythristic Thamnophis sirtalis parietalis
2.2 Iowa snow Thamnophis radix
0.2 het Christmas albino Thamnophis radix
1.1 double het cherry erythristic, albino Thamnophis sirtalis sirtalis
1.1 melanistic Thamnophis sirtalis sirtalis
1.1 triple heterozygous for amelanistic,carmel, and stripe Pantherophis guttatus
0.1 anerythristic motley Pantherophis guttatus
0.1 Okeetee Pantherophis guttatus

Well,

One of the clutches was laid at my friend's house and I'm not sure of the sex of the three normals in her clutch. (Clutch of six).

As far as mine go -

Clutch of six - .3 PS, 1.2 N
Clutch of 7 - .3 PS, 1.3 N
Clutch of seven with a PS daddy and a Mojo Daddy - .2 pins, 2.2 N, 1.0 mojo (no way to know who fathered the normal).

So, we got a pretty reasonable ration of pins v. normal - nothing seems amouk there. Maybe his male swimmers are slow? Either way, not a bad thing to have a boy who fathers alot of girls!

Thanks for the math correction - I must have lost count lol.

Christy

Yes, as the poster below pointed out it's the female that gives the z or w to determine gender in snakes. Now maybe there is some difference in w egg cells that makes them harder to be fertilized by a pinstripe sperm? But unless others are reporting skewed pinstripe gender ratios your case is probably just random luck. 1 in 2048 isn't astronomical.

Yes of course, sorry, as I stated the male is homogametic(ZZ) so of course the male only produces (Z) sperm, was thinking in human terms sorry, so male could not be producing W sperm, I obviously wasn't thinking when I wrote that, but yes maybe the Pin's Z sperm has trouble with the W eggs like you said could be a possibility but also as you stated would not be generally charaterized to Pin unless many others reported the same scewed ratios, but could be relating only to that particular individual however. True, 1 in 2048 which actually I had failed to convert to percentage, which corrected is only 0.0488% for 11 like coins, isn't astro.
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Jeff Benfer

1.0 pastel Python regius
1.1 mojave Python regius
0.1 normal Python regius
1.3 Terrapene carolina thriunguis
2.3 Terrapene carolina carolina
4.1 Kinosternon baurii
1.1 Malaclemys terrapin terrapin
2.2 double het albino and anerythristicThamnophis sirtalis parietalis
1.0 anerythristic Thamnophis sirtalis parietalis
2.2 Iowa snow Thamnophis radix
0.2 het Christmas albino Thamnophis radix
1.1 double het cherry erythristic, albino Thamnophis sirtalis sirtalis
1.1 melanistic Thamnophis sirtalis sirtalis
1.1 triple heterozygous for amelanistic,carmel, and stripe Pantherophis guttatus
0.1 anerythristic motley Pantherophis guttatus
0.1 Okeetee Pantherophis guttatus

Well 1 in 2048 may not win you the lottery, but I'll take those odds any day!
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Ryan Sherman
Scottsdale, Arizona
www.ThePaintedPython.com

If I remember correctly -- in Balls its the females that determines the sex of the offspring -- so maybe it's just a fluke?

But it is odd -- tho I had a male through two all male clutches this season -- I must have gotten some of your males.
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Tosha
JET Pythons

Crazy, hope you were hoping for some holdback females.

I'm sure it will even out for you somewhere else, my first clutch of possible het lavenders was 1.6, but then my first clutch of het caramels was 5.1
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-Jeff
http://jefflumanreptiles.com

.....getting too many males here.......trade me odds......?
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