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The 0 denotes the absence of a second sex chromosome. In some species of reptiles, including alligators , some turtles , and the tuatara , sex is determined by the temperature at which the egg is incubated during a temperature-sensitive period. This system is observed in a number of insects, including the grasshoppers and crickets of order Orthoptera and in cockroaches order Blattodea. In this system, most females have two of the same kind of sex chromosome XX , while most males have two distinct sex chromosomes XY. However, it is known that the removal or damage to the ovaries of female birds can lead to the development of male plumage, suggesting that female hormones repress the expression of male characteristics in birds.

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