The metaphase scaffold consists of a dense network of fibers. Threads of DNA emanate from the scaffold, apparently as loops of average length 30 to 90 kb.

TLS Online TPP Program

#Id: 9202

#Unit 11. Evolution and Behavior

Disruptive Natural selection

Disruptive selection favors the survival of individuals at both extremes of a range, rather than the  intermediate.

Increase variance in the population because select those phenotype which are away from mean.

It maintain balance polymorphism and maximum selection coefficient value.

TLS Online TPP Program

#Id: 5271

#Unit 7. System Physiology – Animal

SA node has Prepotential or pacemaker potential which is the gradual potential rise from the resting membrane potential to threshold  ( -40 mV) & this occur spontaneously.

TLS Online TPP Program

#Id: 9443

#Unit 11. Evolution and Behavior

Parental care

Caring of young one– Prevent from predator and stress full condition, providing. Parental care is fixed action pattern.

Parental care and clutch size is inversionally proportional.

TLS Online TPP Program

#Id: 5781

#Unit 7. System Physiology – Animal

Each spherical follicle is surrounded by a single layer of polarized epithelial cells and filled with pink-staining proteinaceous material called colloid.

TLS Online TPP Program

#Id: 6964

#Unit 8. Inheritance Biology

Philadelphia chromosome

Reciprocal translocation between the long arm of chromosome 22 and the tip of the long arm of chromosome 9. This translocation produces a shortened chromosome 22, called the Philadelphia chromosome.