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Chromosomal or Temperature Based?

D

daisy

Snow! Snow!
Because I lead a boring life and have nothing better to do, I often find myself sitting around wondering how the world works...which brings about a question for the genetics geeks among us...
Is the sex of a hatchling determined by the incubation temperature of the eggs like it is with turtles, or is it determined by chromosomes like it is with people? I'd appreciate some thoughts on this one...

"Who knows where thoughts come from...they just appear"-Words of wisdom from Lucas in "Empire Records".
 
I don't believe the temps are any factor. I had fewer males than females last season but they were all in the same incubator and kept at the same temps.
 
Temp based

I dont know about that, I tend to believe from my own experiences there is something directly related to temps and sexes. My first year breeding cornsnakes I kept all my clutches a little too warm and almost all were males. The following years I turned the heat down a bit and I get more and more females. Now its pretty 50/50 when I keep the eggs at 80/82F. But I dont have nearly as many as some others do, so please keep that in mind....I can only speak for myself.
 
I don't think incubation temp has anything to do with the sex outcome of cornsnakes. All of my clutches are incubated at the same temps, and I get some clutches 50:50, some higher in males and some higher in females. It's just the toss of the coin...all averages out in the long-run.
 
I'd agree

Temps do not appear to have any impact on a haatchling corn's gender.
 
For what it's worth, the people who look at chromosomes have found 18 pairs of chromosomes in the corn snake. One pair is made up of two large chromosomes in males and a large and a smaller chromosome in females. This is similar to male birds' ZZ sex chromosomes and female birds' ZW sex chromosomes. And it is the reverse of the XY sex chromosomes in male mammals and XX sex chromosomes in female mammals.
 
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