The selection gradient measures the strength of directional selection acting on a quantitative trait

TLS Online TPP Program

#Id: 1051

#Unit 5. Developmental Biology

Homeobox transcription factors, or Hox genes, play an essential role in specifying whether a particular mesenchymal cell will become stylopod, zeugopod, or autopod.

TLS Online TPP Program

#Id: 2520

#Unit 13. Methods in Biology

Capillary zone electrophoresis can analyze hybridization probes, gene-cloning, DNA sequencing, polymerase chain reaction (PCR), HIV load, site-directed mutagenesis, & antisense therapeutics.

TLS Online TPP Program

#Id: 7427

#Unit 5. Developmental Biology

When the ratio of PSF relative to that of bacteria exceeds a certain threshold, cells stop proliferating and initiate the expression of genes that are required for their aggregation.

TLS Online TPP Program

#Id: 1994

#Unit 3. Fundamental Processes

The polyadenylation site has two cis-acting signals: 

An upstream AAUAAA motif, which is usually located 11 to 30 nucleotides from the site  A downstream U-rich or GU-rich element.

TLS Online TPP Program

#Id: 432

#Unit 2. Cellular Organization

Core DNA invariant length of 146 bp contains core and linker histones so Mnase cuts after H1 binding site.