Does Defendant's failure to object to the instruction at trial forfeit the issue?

Does Defendant's failure to object to the constitutionality of the statutes in the trial court forfeit this issue on appeal? (California, United States of America)

Is a defendant's failure to object on appeal cognizable because the issue is not cognizable on appeal because trial counsel rendered ineffective assistance by failing to object? (California, United States of America)

Does the Attorney General have forfeited the issue of a defendant's right to object to the instruction that the jury instructions omitted an essential element of the charge? (California, United States of America)

Is a defendant's claim that the trial court's failure to provide him with the means and subpoena witnesses to defend at trial a violation of his Sixth Amendment right to represent himself at trial reversible? (California, United States of America)

Does a defendant's failure to object or request clarifying or corrective language in a jury instruction forfeit an appellate challenge to that instruction? (California, United States of America)

Is a defendant's failure to object below forfeited the issue of an instruction in a medical malpractice case? (California, United States of America)

Is a defendant's failure to object to or request that an instruction be omitted or omitted from a jury's instructions forfeits his claim on appeal? (California, United States of America)

Is a Defendant's failure to object or request a clarifying instruction below forfeits his ability to challenge the given instruction? (California, United States of America)

Does a defendant's failure to object when the instruction was given forfeit his challenge on appeal? (California, United States of America)

How have we dealt with the Attorney General's contention that a defendant forfeited any claim of error by failing to object or request modification to an instruction in the trial court? (California, United States of America)