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Unformatted text preview: (competent) (not competent) Figure A.12 Pedigrees of mating type switching. (a) Pedigree
of mating types in divisions of a homothallic (HO) spore cell. Yeast
cells reproduce by budding. The inexperienced spore cell (one
that has not yet divided) produces a daughter cell (D1) in addition
to the mother (S) and both are still . With the next division of the
spore cell, producing S and D2, mating type can change. (b) When
a mother cell divides to produce a mother and a daughter cell,
switching can occur and will be seen in both resulting cells. When
a daughter cell is produced, it always has the same mating type as
the mother cell. (c) The ability of cells to switch is dependent on
the cell having undergone at least one cell division. Therefore, a
newly arising daughter cell is not competent to switch, whereas
the mother cell from which it arose is competent to switch. The
competency to switch is therefore asymmetric. A.3 Mating: Cell-to-Cell
Pheromones Triggers the
Conversion of Haploid a and
Cells to a/ Diploids Mating is the result of a genetic program that allows a cells
and cells to...
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This note was uploaded on 10/03/2013 for the course BI 206 taught by Professor Celenza during the Spring '08 term at BU.
- Spring '08