Young individuals are always male. Journal of Animal Ecology. Another example in which sex determination is affected by the location of the organism is the case of the slipper snail Crepidula fornicata. A Green turtle hatchling heads to sea in the northwest Hawaiian islands.
The Journal of Experimental Zoology. Proceedings of the Royal Society B. The threshold temperature at which the sex ratio is even is
At temperatures in between, the broods will give rise to individuals of both sexes. Harvey, Christine Janis, and John Heiser. Therein it differentiates into a minute 1—3-mm-long male that is essentially a sperm-producing symbiont of the female see Figure 3.
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One cause of TSD is the enzyme aromatase. They concluded that this differentiation in climate causes divergent selection on regulatory elements in the sex-determining network allowing for the emergence of sex chromosomes in the highlands. Evolution and Development.
While males and females will on average have exactly the same number of offspring, female reproductive capacity is more predictable than male reproductive capacity. This evolutionary model, called the Charnov-Bull model, outlines the conditions under which the evolution of environmental sex determination occurs, and scientists later applied it to vertebrates with TSD.
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