Write short notes in 150 words:
Paedomorphosis
Paedomorphosis is a captivating evolutionary phenomenon where adult organisms retain traits that were once characteristic only of their juvenile or larval stages. It's a type of heterochrony, a shift in the timing or rate of developmental events. There are broadly two mechanisms: neoteny and progenesis. In neoteny, the somatic (body) development slows down, while the gonadal (reproductive) development proceeds at a normal rate. This means the animal becomes reproductively mature while still possessing larval features, as famously seen in the axolotl, which can reach sexual maturity while retaining its feathery external gills and aquatic lifestyle. Progenesis, on the other hand, involves an accelerated maturation of reproductive organs, leading to sexual maturity occurring in an organism that is still morphologically a juvenile. Paedomorphosis can be a significant pathway for evolutionary innovation, allowing species to adapt to new environments or exploit new niches by retaining advantageous juvenile traits.
Answered By:
Write short notes in 150 words:
Metagenesis
Write short notes in 150 words:
Book lungs
Write short notes in 150 words:
Torsion and detorsion in gastropods
Write short notes in 150 words:
Draw a well-labelled diagram of human eye and write its functions.
Describe the comparative anatomy of digestive system in vertebrates.
Give an illustrated account of reproduction in sponges.
Describe the general features, distribution and social organization in termites.
Describe the mechanism of parental care in amphibians with suitable examples.
Describe the different stages of life cycle of Pheretima with the help of suitable diagrams.
Discuss the various modes of nutrition in protozoa.
How will you manage a case of misplaced copper-T (Cu-T)?
Describe the embryogenesis, clinical features and principles of management of cleft palate.
Write short notes in 150 words:
Metagenesis
Write short notes in 150 words:
Book lungs
Write short notes in 150 words:
Torsion and detorsion in gastropods