HoMe PaGe

Monotremes

Loading...

Wiki info

The sequencing of the platypus genome has also provided insight into the evolution of a number of monotreme traits, such as venom and electroreception, as well as showing some new unique features, such as the fact that monotremes possess 5 pairs of sex chromosomes and that one of the X chromosomes resembles the Z chromosome of birds, suggesting that the two sex chromosomes of marsupial and placental mammals evolved after the split from the monotreme lineage. Additional reconstruction through shared genes in sex chromosomes supports this hypothesis of independent evolution. This feature, along with some other genetic similarities with birds, such as shared genes related to egg-laying, is thought to provide some insight into the most recent common ancestor of the synapsid lineage leading to mammals and the sauropsid lineage leading to birds and modern reptiles, which are believed to have split about 315 million years ago during the Carboniferous. The presence of vitellogenin genes (a protein necessary for egg shell formation) is shared with birds; the presence of this symplesiomorphy suggests that the common ancestor of monotremes, marsupials, and placental mammals was oviparous, and that this trait was retained in monotremes but lost in all other extant mammal groups. DNA analyses suggest that although this trait is shared and is synapomorphic with birds, platypuses are still mammals and that the common ancestor of extant mammals lactated. L-ascorbic acid is synthesized only in the kidneys.

Use our keyword tool to find new keywords & suggestions for the search term Monotremes. Use the keywords and images as guidance and inspiration for your articles, blog posts or advertising campaigns with various online compaines. The results we show for the keyword Monotremes will change over time as new keyword trends develop in the associated keyword catoegory and market. For optimum results we recommend just searching for one keyword.

A-Z Keywords

Keyword Suggestions

Interesting pages

Linked Keywords

Keyword Images

Life History and Ecology of the Monotremata
Life History and Ecolo...
Monotremes Lesson Plans and Lesson Ideas | BrainPOP Educators
Monotremes Lesson Plan...
The Evolution Of Vertebrate Diversity at Burlington County ...
The Evolution Of Verte...
Pseudotribos - Wikipedia
Pseudotribos - Wikiped...
A Marvelous Comparison Between Placental Mammals and ...
A Marvelous Comparison...
The Improbable Platypus: 7 Facts That Prove These ...
The Improbable Platypu...
The Zoochat Photographic Guide to Monotremes and ...
The Zoochat Photograph...
Multituberculata - Wikipedia
Multituberculata - Wik...
Buy Blue-winged Kookaburra eggs Image Online - Print ...
Buy Blue-winged Kookab...
Interesting Facts About Hedgehogs | PetHelpful
Interesting Facts Abou...
Buy Striped Possum Image Online - Print & Canvas Photos ...
Buy Striped Possum Ima...
Taronga Zoo. Sydney, Australia - Travel To Eat
Taronga Zoo. Sydney, A...
Buy Spot-tailed Quoll Image Online - Print & Canvas Photos ...
Buy Spot-tailed Quoll ...
Australian Wildlife Lectures: Primary Schools Incursions
Australian Wildlife Le...