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The eggs will hatch approximately 60 to 80 days later, depending on the incubation temperature. In captivity, they can be incubated in a styrofoam fish box, but without a male lizard, the female's eggs will not be fertile. However, a female bearded dragon can retain sperm, and thus produce fertile eggs even after being separated from a male.
Bicephalism is when a bearded dragon is born with two heads and one body. [22] Anasarca is when a bearded dragon is swollen within the egg. Observing eggs in the incubator, an anasarca egg appears to be sweating. The cause of this is not known. [22] Shistosomus reflexa is when the organs of a bearded dragon develop outside of the body. [22]
Temperature-dependent sex determination was first described in Agama agama in 1966 by Madeleine Charnier. [18] A 2015 study found that hot temperatures altered the expression of the sex chromosomes in Australia's bearded dragon lizards. The lizards were female in appearance and were capable of bearing offspring, despite having the ZZ ...
The majority of species are oviparous (egg laying). The female deposits the eggs in a protective structure like a nest or crevice or simply on the ground. [22] Depending on the species, clutch size can vary from 4–5 percent of the females body weight to 40–50 percent and clutches range from one or a few large eggs to dozens of small ones. [23]
When evolving from a genetic XX/XY or ZZ/ZW system to a temperature-dependent system, temperature-dependent sex determination naturally avoids nonviable YY or WW genotypes. [5] The evolution of temperature-dependent sex determination is considered to be adaptive in most hypotheses, with a few suggest neutral or quasi-neutral evolution.
The eastern bearded dragon (Pogona barbata), also known as common bearded dragon or simply bearded lizard, is an agamid lizard found in wooded parts of Australia. [ 1 ] [ 2 ] [ 3 ] It is one of a group of species known commonly as bearded dragons .
Megapode eggs take from 49 to 90 days depending on the mound and ambient temperature. Even in other birds, ambient temperatures can lead to variation in incubation period. [7] Normally the egg is incubated outside the body. However, in one recorded case, the egg incubation occurred entirely within a chicken.
Further, estradiol-17β has been shown to reverse the sex of turtle species when injected into incubating eggs. These eggs were originally placed in are male producing temperatures, but with the estradiol-17β treatment, they would generate females. [34] However, hormone-based sex reversal would be dependent on the gonadal development stages of ...