BIOL 3040 Chapter : Ch 12 LO
Document Summary
Organisms develop new and increasingly efficient ways to acquire, process, transmit, and store information. Sexual reproduction is a classic example of how these processes are difficult to reverse. Genetic imprinting is the phenomena in which alleles are expressed differently when inherited from the mother than when inherited from the father. Once this evolves in a species, it creates a barrier: Any parthenogenically produces offspring would have a mother but not a father, and they would thus fail to express a number of important genes that are expressed only from the paternally derived copy. A gene (neostls2) that is able to confer resistance to an antibiotic when located in nuclear genes was inserted in a chloroplast. They are not required to aggregate in order to survive. Since cell growth is dependent on these chloroplast proteins, and cell division depends on cells reaching a critical size, cells in which rega is expressed remain small and produce flagella, becoming the soma cells.
