SEXUAL & ASEXUAL REPRODUCTION INVOLVE CELL DIVISION ASEXUAL REPRODUCTION INVOLVES ONE PARENT: through binary fission, budding, & regeneration –One organism.

SEXUAL & ASEXUAL REPRODUCTION INVOLVE

CELL DIVISION• ASEXUAL REPRODUCTION INVOLVES

ONE PARENT: through binary fission, budding, & regeneration– One organism makes 1 or more new organisms

that are identical to itself & live independently of it. Are genetically identical.

• SEXUAL REPRODUCTION INVOLVES 2 PARENT ORGANISMS

ASEXUAL REPRODUCTION• Binary fission occurs in prokaryotes; interphase & cytokinesis,

but no mitosis (because no nucleus). Parent organism splits in 2, making 2 genetically identical, independent daughter cells. Since all prokaryotes are single-celled, cell division & reproduction by binary fission are the same thing.

• Budding occurs in both uni- & multi-cellular organism. Buds form on a part of the body as a cell with the same genetic material as the parent. It grows until it forms a complete or nearly complete new organism identical to the parent. Usually it will break off & be independent.

• Some yeast cells & single-celled organisms reproduce asexually by budding. But most occurs in multicellular organisms (hydras & kalanchoe plant)

ASEXUAL REPRODUCTION

• REGENERATION: the process of new tissue growth at the site of a wound or lost limb.

• This can be asexual reproduction (starfish cut in half form 2)

• Plant cuttings can form identical independent plants.

• GENERATION TIME: time it takes for one generation to produce offspring.

• For bacteria, this is less than 30 minutes; so in 1 hour bacteria can increase to 4X the original number.

• This is why you can get sick so quickly from them.

• Rare genetic changes are more likely to occur in bacteria due to gener.time

SEXUAL V. ASEXUAL REPRODUCTION

• Reproduction of multicellular organisms often involves sexual reproduction & asexual cell division.

• If you grow a plant from a cutting, the new plant will be genetically identical to the parent. But if plants grow from seeds they have DNA from 2 parents (sperm & egg unite) and may look different from one parent.

• Cell division is part of both sexual & asexual reproduction.

• Mitosis produces cells identical to parent cells.

• Diversity of life on Earth due in part to combining genetic material from 2 parents in sexual reproduction.