Genetic recombination of two auxotrophic strains producing prototrophs
Genetic recombination of two auxotrophic strains producing prototrophs
质疑： 细菌的杂交实验获得重组子可能 原因： ⑴转化 ⑵ 互养
质疑： 细菌的杂交实验获得重组子可能 原因： ⑴转化 ⑵ 互养
Davis's U tube experiment showing that physical contact between the two bacterial strains of the earlier experiment was needed in order for genetic exchange to occur. Porous cotton plug Pressure or suction Strain A Strain B Fine-pored filter
When strain A and B auxotrophs are grown in a common medium but separated by a filter, no genetic recombination occurs and no prototrophs are produced. The apparatus shown is a Davis U-tube
When strain A and B auxotrophs are grown in a common medium but separated by a filter, no genetic recombination occurs and no prototrophs are produced. The apparatus shown is a Davis U-tube
结 论 （1）菌株A与菌株B之间发生了杂交， 发生了遗传物质的转移，出现了原养型。 （2）杂交过程中，两菌株的接触是必 须的
结 论 （1）菌株A与菌株B之间发生了杂交， 发生了遗传物质的转移，出现了原养型。 （2）杂交过程中，两菌株的接触是必 须的