The phrase "biased in" is correct and usable in written English.
You can use it to refer to being biased towards something or someone. For example, "The judge was biased in favor of the defendant."
The world is biased in favor of good-looking people.
Palestinians consider the Bush administration biased in favor of Israel.
"You get called biased, in the police's pay.
He was absolutely biased in favour of England.
Naturally, it was biased in favour of claimants.
Is the electoral system biased in favour of Labour?
Dr. Slater also said that Mr. Stover's report was flawed and biased in favor of Pharmacia.
Both sides argued the other was biased in their interpretation of the evidence.
Adult breeding sex ratio was male-biased in the Western population and female-biased in the Central population.
Four genes were male-biased in D. melanogaster but were female-biased in D. suzukii, whereas 18 were female-biased in D. melanogaster but were male-biased in D. suzukii.
Three genes (CG13690, CG3024, CG4593) were male-biased in D. ananassae, but female-biased in D. melanogaster, while two genes (CG12684, CG7387) were female-biased in D. ananassae, but male-biased in D. melanogaster.
