asexual reproduction ms. zimmerman 7 th grade science

Asexual Reproduction

Ms. Zimmerman 7th grade science

REVIEW!

• What is reproduction? What’s the point?• Stand up/Sit down– Stand up if it’s ASEXUAL– Sit down if it’s SEXUAL

Involves two parent organisms

SEXUAL

So how many parents are there in ASEXUAL?

Your human mom or dad is a single parent

SEXUAL

The offspring are exact clones of its parent

ASEXUAL

The genes get weaker from generation to generation

SEXUAL

Strength in variety of offspring

SEXUAL

The species is not very good at resisting disease

ASEXUAL

Asexual vs. Sexual

• when offspring are produced from a single parent, it is called asexual reproduction

• the offspring are identical to the parent!

• By cell division, one cell divides to become two.

• Used by simple organisms, such as protozoans, to reproduce.

• In some multicellular organisms, this process is used to grow in size or to replace tissues.

• when offspring are produced from two parents, it is called sexual reproduction

• the offspring is a combination of the two parents

Kinds of Asexual reproduction

• Binary Fission• Budding• Sporulation• Regeneration• Vegetative Propagation

Asexual Reproduction

• carried out by unicellular organisms, many lower animals, and many plants

• offspring are identical to the parents• the process is usually rapid and

results in a large number of offspring• there are several types of asexual

reproduction

Vocab

• Genes• Clone• Offspring• Cell division

Kinds of Asexual reproduction

• Binary Fission• Budding• Sporulation• Regeneration• Vegetative Propagation

Binary Fission• the equal division of nuclear material

and cytoplasm resulting in 2 new organisms

• Video: http://youtu.be/gEwzDydciWc

Your cells are doing this RIGHT

NOW!!!

Budding - unicellular

• similar to binary fission BUT has an unequal division of cytoplasm; offspring is smaller than the parent

Budding - multicellular

• a bunch of cells form a smaller organism on the original if conditions are favorable

• the bud develops into a fully functional organism which may or may not detach from the parent

• Video: http://youtu.be/489CSop00sY

Sporulation

• spores are single, specialized cells that are released from the parent and can develop into new individuals if the conditions are right

• occurs in molds and mushrooms

Regeneration

• A) of body parts– new tissues can be produced to replace those lost or

damaged– occurs in such animals as lobsters, crabs, and gecko

lizards

• B) new organisms– when an entire new organism is produced from part of

the original organism– occurs in seastars and planarians (a type of simple

annelid)

(as long as a ray--one of the points--has some of the center piece, it can grow into a whole new seastar!)

Vegetative Propagation

• when new plants develop from roots, stems or leaves of the parent organism

• many different types: cuttings, bulbs (onions), tubers (potatoes), grafting (apples)

***ASEXUAL REPRODUCTION IS MITOSIS!!!***

Brainpop!

• http://www.brainpop.com/science/cellularlifeandgenetics/asexualreproduction