Physics 

"Virus In Roming"

   V = IR

   V  - Voltage

   I   - Current

  R  - Resistance

Chemistry

Group 17 (halogens)

Fluorine, Chlorine, Bromine, Iodine, Astatine

Explanation: Group 17 (chalcogens)

F Cl Br I At

F    -  Fat

C   -  Clowns

Br  - Bring 

I    -   In 

At -Attention

Biology

Hardy – Weinberg equilibrium : causes for deviation from it.

“Maggie May Does Not Smoke”

    M   -     Mutations

    M   -    Migration

     D   -    Drift

     N  -     Non – random mating

     S   -    Selection