[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index][Subject Index][Author Index]
Re: Terrapins: At Well Past 100, They're in the Mood
Quoting Jura <firstname.lastname@example.org>:
Not all reptiles use TDSD.
Many use genetics instead.
Hence why the article used the qualifier: may. As in
dinosaurs "may have" used it.
Yes, but I still see some fuzzy logic here:
1. Many if not all coelurosaurs were/are likely endothermic
homeotherms, and many maniraptorans, at least, apparently did/do
incubate their eggs using body warmth.
2. IIRC, different non-avian reptile groups utilize different schemes
of temperature-dependent sex determination; in some, warmer eggs
produce males, in others, females.
3. It is possible that chromosomal sex determination is plesiomorphic
for amniotes. Didn't some of the many platypus sex chromosomes turn
out to be homologous to the avian W and Z chromosomes?
Department of Linguistics
University of Michigan
"Creativity is the sudden cessation of stupidity."
--Edwin H. Land