TLS Online TPP Program

#Id: 10348

#Section 2: General Biology

BAFF-R expression is first detected in T1 B cells and increases steadily there after.

Signaling through the BAFF/BAFF-R axis promotes survival of transitional B cells by inducing the synthesis of anti-apoptotic factors such as Bcl-2, Bcl-xl, and Mcl-1

TLS Online TPP Program

#Id: 9203

#Section 3: Genetics, Cellular and Molecular Biology

Balance natural selection

Balancing selection is a type of natural selection that maintains genetic diversity in a population.

In balancing selection, two or more alleles are kept in balance, and therefore are  maintained in a population over the course of many generations.

TLS Online TPP Program

#Id: 8886

#Section 3: Genetics, Cellular and Molecular Biology

TLS Online TPP Program

#Id: 8963

#Section 3: Genetics, Cellular and Molecular Biology

If the duplicate is redundant and does not provide a fitness benefit, it will be lost by deletion or the accumulation of loss of-function mutations.

A second fate is that a duplicate can simply retain its original function.

TLS Online TPP Program

#Id: 7762

#Section 2: General Biology

In a covalent bond, electrons are shared between atoms. In an ionic bond, electrons are transferred between atoms.