Knowra Temperature-dependent sex determination Temperature-dependent sex determination Temperature-dependent sex determination is a developmental system in which incubation temperature influences whether an offspring develops as male or female, rather than sex being determined solely by sex chromosomes.
Thermosensitive period : A developmental interval when environmental temperature can alter the sex of an embryo. Temperature has its sex-determining effect only during this limited stage of incubation.
Red-eared slider : A freshwater turtle native to the southern United States and northern Mexico. Its eggs develop as males at cooler temperatures and females at warmer temperatures.
Aristotle : An ancient Greek philosopher whose writings addressed biology, physics, ethics, and politics. His observations linked environmental warmth during incubation with the sex of developing crocodiles.
Climate change and reptiles : The effects of long-term climate shifts on reptile physiology, distribution, and reproduction. Rising nest temperatures can skew offspring sex ratios in species with temperature-dependent sex determination.
Genotype–environment interaction : A situation in which an organism's genotype changes how it responds to environmental conditions. The same incubation temperature can produce different outcomes across species, populations, or genetic backgrounds.
Gonadal differentiation : The developmental process by which an undifferentiated gonad becomes an ovary or testis. Temperature ultimately changes sex by shifting the developing gonad toward ovarian or testicular fate.
American alligator : A large crocodilian reptile native to the southeastern United States. Its embryos typically develop as females at lower and higher temperatures, and as males at intermediate temperatures.
Madison Grant : An American naturalist and conservationist who studied reptiles and promoted eugenics. His early twentieth-century observations connected incubation temperature with sex ratios in turtles.
Nest-site selection : The process by which animals choose locations to lay or incubate eggs. Shade, soil, and nest depth can buffer temperature and influence offspring sex.
Sex reversal : Development of a phenotypic sex that differs from the sex indicated by an individual's chromosomes or genes. Temperature can override chromosomal signals in some reptiles, raising questions about developmental flexibility.
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