Draw a concept map of how lettuce seeds germinate. A biotechnology scientist alters the Ti plasmid by inducing a series of mutations in the plasmid. The mutant plasmids are put into Agrobacterium tumefaciens and the bacteria are plated out to form individual colonies. Susceptible plant hosts are wounded and inoculated with bacteria from one of the colonies.
Many plants form callus tissues from the inoculation of different colonies of mutant bacteria.
The calli are grown on in tissue culture. List the changes occurring during hormone induced senescence in plants. You might choose fruit ripening as an example of this process. Onion plants form bulbs under photoperiodic control. Onions are long-day plants in terms of bulb formation.