Comments on: Good news: The Second Coming has Arrived!!

By: Brian

Brian — Sat, 09 Feb 2008 22:34:09 +0000

Interesting! Now that you say it, it seems like I’ve heard that somewhere before.I guess it would be possible for the zoo to determine the results by changing the temperature.

By: Greg Laden

Greg Laden — Sat, 09 Feb 2008 18:43:21 +0000

Reptiles’ sex determination is based on the temperature of incubation of the egg.

By: Gene Goldring

Gene Goldring — Sat, 09 Feb 2008 18:21:37 +0000

Biblical based exemptionalism sure is taking a beating.

By: Erp

Erp — Sat, 09 Feb 2008 14:37:40 +0000

Not all animals use the mammalian XX (female) XY (male) or the birds ZZ (male) and ZW (female)) to distinguish the sexes. I believe some reptiles use incubation temperature though others use chromosomes.Seehttp://www.nature.com/nature/journal/v451/n7178/full/451527a.htmlfor some infoNote that in bees fertilized eggs become females (either queens or workers depending on diet) while unfertilized eggs become males (drones).

By: Brian

Brian — Sat, 09 Feb 2008 13:32:12 +0000

I thought that parthenogenesis always produced female offspring because the they would have inherited both x chromosomes from the mother.