Directional Natural selection

Directional selection favors individuals at one extreme of a phenotypic distribution that have greater reproductive success in a particular environment.

TLS Online TPP Program

#Id: 9280

#Section 2: General Biology

The interaction between NFR and SYMRK initiates calcium spiking in the nucleus, presumably via a second messenger molecule.

Core symbiotic genes are activated.

Cytokinin signaling is initiated.

TLS Online TPP Program

#Id: 8978

#Section 3: Genetics, Cellular and Molecular Biology

Proportion of base pairs that differ between sequences(D) 

D= 2rt

r  = rate of divergence per base pair per million  

T = time

TLS Online TPP Program

#Id: 9206

#Section 3: Genetics, Cellular and Molecular Biology

Genetic drift 

Genetic drift is an evolutionary force, in which allelic frequency change over generation Just by chance (sampling error). 

The deviations from the expected ratios are random, the direction of change is unpredictable.

TLS Online TPP Program

#Id: 8130

#Section 2: General Biology

TLS Online TPP Program

#Id: 7950

#Section 3: Genetics, Cellular and Molecular Biology

Prior to transfer to a nascent chain in the lumen of the  ER, the oligosaccharide precursor is assembled on amembrane- attached anchor called dolichol phosphate, a longchain polyisoprenoid lipid