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TLS Online TPP Program

#Id: 8860

During S phase
DNA-bound G1 cohesins Convert into cohesive complexes by cohesin acetyl transferases (CoATs)
which acetylate Smc3 subunit & prevents unloading of cohesins by Pds5-Wapl, thereby stabilizing the cohesins on chromosomes.

#Unit 2. Cellular Organization #Steps in cell cycle, regulation and control of cell cycle #Part B Pointers
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TLS Online TPP Program

#Id: 2269

#Unit 11. Evolution and Behavior

Phenotypic plasticity can be visualized with the reaction norm.
TLS Online TPP Program

#Id: 8950

#Unit 11. Evolution and Behavior
TLS Online TPP Program

#Id: 8951

#Unit 11. Evolution and Behavior
TLS Online TPP Program

#Id: 8952

#Unit 11. Evolution and Behavior

One is unequal crossing over, in which recombination happens between different positions on chromosomes that are misaligned during meiosis. 
Another is replication slippage, in which the DNA polymerase loses its place and copies a segment of chromosome twice.
TLS Online TPP Program

#Id: 8953

#Unit 11. Evolution and Behavior

A third way that gene duplicates arise is by retrotransposition.

Here the messenger RNA from a gene is reverse-transcribed to DNA, which is then integrated into the genome.
TLS Online TPP Program

#Id: 8954

#Unit 11. Evolution and Behavior

As a chromosome with a new gene duplicate spreads through a population, there is polymorphism in the number of copies of the gene that individuals carry. This situation, called copy number variation.