Organismal Development Part 1 Prokaryotes and Protists

Asexual Reproduction

Sexual Reproduction

Asexual – Binary Fission Cell wall Origin of replication Plasma membrane E. coli cell Bacterial chromosome Chromosome replication begins. Soon thereafter, one copy of the origin moves rapidly toward the other end of the cell. Two copies of origin Origin Origin Replication continues. One copy of the origin is now at each end of the cell. Replication finishes. The plasma membrane grows inward, and new cell wall is deposited. Two daughter cells result.

Asexual - Budding

Platyhelminthes - Regeneration

Asexual – Binary Fission Cell wall Origin of replication Plasma membrane E. coli cell Bacterial chromosome Chromosome replication begins. Soon thereafter, one copy of the origin moves rapidly toward the other end of the cell. Two copies of origin Origin Origin Replication continues. One copy of the origin is now at each end of the cell. Replication finishes. The plasma membrane grows inward, and new cell wall is deposited. Two daughter cells result.

Transformation

Bacterial Transduction Phage DNA A+ B+ A+ B+ Donor cell A+ Crossing over A+ A– B– Recipient cell A+ B– Recombinant cell

Conjugation in Bacteria Sex pilus 5 µm

Sexual Reproduction

Cell Cycle with checkpoints (Is all going according to plan?)

G2 followed by Mitosis

Mitosis continued followed by cytokinesis