PLS HELP how does gene knockout work?

This method involves creating a DNA construct containing the desired mutation. For knockout purposes, this typically involves a drug resistance marker in place of the desired knockout gene. This method then relies on the cell's own repair mechanisms to recombine the DNA construct into the existing DNA.

i think that c)gold was found there

but i am not sure

after making a punnet square using bv bv bv bv you will find that the ratio will be 9: 7 or a 128.6% probability.

hope this