one of Antennapedia’s functions is to repress the genes that would trigger antenna and eye development.

TLS Online TPP Program

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#Unit 13. Methods in Biology

The PCR involves two oligonucleotide primers, 17–30 nucleotides in length, which flank the DNA sequence that is to be amplified.

TLS Online TPP Program

#Id: 2527

#Unit 13. Methods in Biology

Duration of denaturation step in the first cycle of PCR is usually 2 min at 94 °C.

TLS Online TPP Program

#Id: 2528

#Unit 13. Methods in Biology

The duration of annealing step is usually 1 min during the first as well as the subsequent cycles of PCR. 

TLS Online TPP Program

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#Unit 13. Methods in Biology

The duration of primer extension is usually 2 min at 72°C

TLS Online TPP Program

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#Unit 13. Methods in Biology

The specificity of the PCR depends crucially upon the primers. The following factors are important in choosing effective primers

Primers should be 17 to 30 nucleotides in length

A GC content of about 50% is ideal. For primers with a low GC content, it is desirable to choose a long primer to avoid a low melting

 temperature.

Sequences with long runs (i.e., more than three or four) of a single nucleotide should be avoided.

TLS Online TPP Program

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#Unit 13. Methods in Biology

Primers with significant secondary structure are undesirable.