Dragons Offspring
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 NJ24 JINHAO CHINESE DRAGONS OFFSPRING FOUNTAIN PEN $9.99 Time Remaining: 2d 1h 45m |
 LJ16 CHINESE DRAGONS OFFSPRING FOUNTAIN PEN W LEATHER PEN CASE $16.99 Time Remaining: 2d 10h 25m |
 LJ17 CHINESE DRAGONS OFFSPRING FOUNTAIN PEN LEATHER PEN CASE $16.99 Time Remaining: 3d 9h 15m |
 LP11 CHINESE DRAGONS OFFSPRING FOUNTAIN PEN W LEATHER PEN CASE $16.99 Time Remaining: 3d 12h 55m |
 NJ16 JINHAO CHINESE DRAGONS OFFSPRING FOUNTAIN PEN $9.99 Time Remaining: 5d 1h 55m |
 NJ17 JINHAO CHINESE DRAGONS OFFSPRING FOUNTAIN PEN $9.99 Time Remaining: 6d 1h 45m |
 LJ24 CHINESE DRAGONS OFFSPRING FOUNTAIN PEN W LEATHER PEN CASE $16.99 Time Remaining: 6d 10h 5m |
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Dragons Offspring
How does parthenogenesis work?
I have always been intrigued by the "virgin birth" of unisexual Cnemidophorus species (a whip tail lizard from the American southwest), and of two geckos, Lepidodactylus lugubris and Hemidactylus frenatus.
Recently, I have read news reports of Komodo Dragons being parthenogenetic as well.
The offspring are not genetic clones of their mothers, so how does the genetic diversity occur. Is there a recombination of the chromosomes during meiosis?
Please give me some citations that clearly define this. Thanks.
During oogenesis, the egg splits off from a polar body, giving one the vast majority of the cytoplasm. This then happens again giving 1 egg and 3 (or 2, the first one might not divide) polar bodies.
One of these polar bodies can refuse (or never actually leave) resulting in a diploid zygote. This is not a clone due to recombination.
Birds and some reptiles use the ZW sex determining system (inverse of XY) so the female can produce both a male or a female offspring (in birds it is almost always a male).
Mammals are different. Besides the obvious problem of only producing females, for proper development information from the sperm is required.
You can chemically induce a parthogen in mammals, however it never develops normally since genetic imprinting is required from the sperm.
In other words, it can't happen in the wild in mammals.