The season’s top-rated new show and No. 2 new comedy have received full-season orders, coming as the networks gird for what could be a damaging upcoming writers strike.

Yesterday ABC picked up nine more episodes of “Private Practice,” the top-ranked new show among adults 18-49 with a 4.7 adults 18-49 rating through four outings. That brings the “Grey’s Anatomy” spinoff to 22 episodes this season.

CBS also gave a full-season order to “The Big Bang Theory,” its new Monday comedy that has averaged a 3.6 rating through its first month. That makes it the second-ranked new comedy on broadcast, behind ABC’s recently debuted “Samantha Who?.”

The pickups weren’t unexpected. “Practice” is also the highest-rated show on Wednesday night and had promising numbers in Nielsen’s recently released seven-day-playback digital video recorder ratings, where it was among the top most-recorded programs.

In its tough 9 p.m. timeslot, it has led ABC to No. 1 on all four Wednesdays this season as the network attempts to win its first full season among adults 18-49 in years.

“Bang” has been a pleasant surprise for CBS, whose more high-profile new shows like “Cane” and “Kid Nation” have struggled.

The show, about two geeky scientists lusting after their attractive neighbor, has fit well into the network’s long-sinking Monday comedy lineup. It’s building on 8 p.m. lead-in “How I Met Your Mother” by some 10 percent in 18-49s and also outdraws it among total viewers.

But the pickups also come with the networks desperate to store up scripted programming. With a writers strike looming as soon as November, the networks need a backlog of scripted programming to carry them through the winter.

An announcement could come any day on whether members of the Writers Guild of America will strike after a vote earlier this month.

As such, any new show that demonstrates even a bit of promise is getting perhaps more consideration than in past years, as networks worry they won’t have enough scripted shows to fill the airwaves.

Last week, CW gave “Gossip Girl” the year’s first full-season order despite the fact that it’s losing nearly half of its “America’s Next Top Model” lead-in in many key demographics.

CBS has ordered additional scripts for the Tuesday 10 p.m. drama “Cane,” despite lower ratings for the show than last year’s failed timeslot occupant, “Smith.”

And last week NBC gave additional script orders to “Bionic Woman,” “Chuck” and “Journeyman,” though all three have shown big declines since their debuts.