How the detirmation of sex influenced by atmospheric
condition in some ahimals.
Answers
Explanation:
Temperature-dependent sex determination (TSD) is a type of environmental sex determination in which the temperatures experienced during embryonic/larval development determine the sex of the offspring.[1] It is only observed in reptiles and teleost fish.[2][3][4][5] TSD differs from the chromosomal sex-determination systems common among vertebrates. It is the most popular and most studied type of environmental sex determination (ESD). Some other conditions, e.g. density, pH, and environmental background color, are also observed to alter sex ratio, which could be classified either as temperature-dependent sex determination or temperature-dependent sex differentiation, depending on the involved mechanisms.[6] As sex-determining mechanisms, TSD and genetic sex determination (GSD) should be considered in an equivalent manner,[7] which can lead to reconsidering the status of fish species that are claimed to have TSD when submitted to extreme temperatures instead of the temperature experienced during development in the wild, since changes in sex ratio with temperature variation are ecologically and evolutionally relevant.[6]
Answer:
In many species, sex determination is genetic: males and females have different alleles or even different genes that specify their sexual morphology. In animals this is often accompanied by chromosomal differences, generally through combinations of XY, ZW, XO, ZO chromosomes, or haplodiploidy.