Dictionary > Puffs

Puffs

puffs
(Science: molecular biology) Expanded areas of a polytene chromosome. at these areas the chromatin becomes less condensed and the fibres unwind, though they remain continuous with the fibres in the chromosome axis.
A puff usually involves unwinding at a single band, though they can include many bands as in balbiani rings. Puffs represent sites of active rNA transcription. The pattern of puffing observed in the larvae of drosophila, in different cells and at different times in development provides possibly the best evidence that differentiation is controlled at the level of transcription.


You will also like...

Electromagnetic spectrum of a brain
Sleep and Dreams – Neurology

While learning and intelligence are associated with the functions of a conscious mind, sleep and dreams are activities o..

temperature - abiotic factor
Abiotic and Biotic Factors

This tutorial deals with the abiotic factors of the freshwater environment that determine what sort of life would be sui..

sponge
Primitive Animals

Life, as we know it today, is presumed to have started in the sea and many of them were likely eukaryotic animal-like or..

Genetics – Lesson Outline & Worksheets
Genetics – Lesson Outline & Worksheets

  Topics Modules Quizzes/Worksheets Description Introduction to Genetics Genetics – Definition: Heredity and ..

Crossing Over and Genetic Diversity
Inheritance and Probability

Gregor Mendel, an Austrian monk, is most famous in this field for his study of the phenotype of pea plants, including ..

river
Running Water Freshwater Communities

This tutorial introduces flowing water communities, which bring new and dithering factors into the equation for possible..