How will a cross between two homozygous parents, one dominant and one recessive, influence future generations

Which of the follow describes a disadvantage secondary sources have compared to primary sources?

Astudent poured a solution of bromothymol blue indicator into three test tubes. then he placed an aquatic plant in two of the test tubes, as shown below. he placed a stopper on each test tube and placed them all in the dark for 24 hours. bromothymol blue turns from blue to yellow in the presence of co2

Fredrick griffith made a scientific discovery in 1928