Male stickleback fish develop red colour on their ventral side in the breeding season and maintain territories. 

When a conspecific male intruder enters their territory, resident males perform an aggressive display. 

The ethologist Niko Tinbergen presented models of different shapes to territorial male stickleback fish. He found that models of any shape elicited aggressive displays, provided the ventral part of the models was coloured red.

TLS Online TPP Program

#Id: 9474

#Unit 4. Cell Communication and Cell Signaling

SHP1 

Binding of an SH2 domain to a phosphotyrosine in the activated receptor unmasks its phosphatase catalytic site

TLS Online TPP Program

#Id: 2132

#Unit 8. Inheritance Biology

If a single crossover takes place in the inverted region an unusual structure results

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#Id: 418

#Unit 2. Cellular Organization

H2AZ variant has 60% sequence identity with canonical H2A and involved in gene activation, heterochromatin–euchromatin boundary formation, cell-cycle progression.

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#Id: 5048

#Unit 3. Fundamental Processes

An unmethylated CG site remains unmethylated after replication.

TLS Online TPP Program

#Id: 7065

#Unit 3. Fundamental Processes

The addition of the 3’-CCA is catalyzed by the enzyme tRNA nucleotidyltransferase, which functions as a nontemplate-directed RNA polymerase.