Cross a roan bull and a roan cow. what phenotypic and genotypic ratios would you get?

Which experiment would most likely contain experimental bias ?

Which best describes how the common cold spreads in the human body? a bacteria burst out of normal cells killing them b viruses replicate inside respiratory cells c bacteria inject dna into normal cells d viruses insert dna into bacteria

Which of the organisms listed below performs nitrogen fixation? a. legumes b. plants c. bacteria d. fungi