Topic: Temperature-dependent Sex Determination In Turtles

Type of paper:	Research Paper
Subject area:	Nature
Academic level:	College
Style:	MLA
Size:	155.5 kB
Word count:	769
Mark awarded:
Date submitted:	2008-11-21 19:15:29
Rating/Votes count:	4.00 / 4

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Temperature-dependent sex determination in turtles
Introduction
Temperature-dependent sex determination (TSD ) is a significant
biological experience recorded for both invertebrates and vertebrates .
Turtles are recognized as lacking of heteromorphic sex chromosomes , it
could be the ZW for female heterogamety or XY for male heterogamety
thus , their means and method used for sex determination is very much
distinct from human beings . Among the family of turtles , only a small
number of turtles do not adapt temperature-dependant sex determination .
The eggs ' incubation temperature at a delicate and susceptible stage of
growth and progress during the mid-trimester activates the gonadal
development which leads to the sex of the hatchling (see
``Temperature-dependent sex determination (TSD . ETI-Turtles of the
World . Moreover , the temperature does not affect the sex-determination
of a soft-shelled turtle but it restrains sex differentiation instead of
causing a differential mortality of sexes (see Bull , J .J . and Vogt , R .C .
``Temperature-dependent sex determination in turtles . Vol , issue . But apparently , temperature influences the sex of hatchling
Chelonia mydas , green turtles , coming from eggs that are hatched in the
beach hatchery in various temperature regimes . Cool and cola nests have
a temperature lower than degrees and do not give more females . Some
inter-sex hatchling were coming from low temperatures (see Morreale ,
S .J , Ruiz , G .J and et . Al . ``Temperature-dependent sex determination :
current practices threaten conservation of sea turtles TSD Patterns in turtles .
There are two TSD patterns that been found out in turtles . In pattern
I , it has one transformation zone of temperature below...

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