Asexual Reproduction Worksheet (Page 4 of 4) in pdf

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Name:_____________________________________________

Date____________

Science 8 – Hagan

Period____________

Asexual Reproduction Jigsaw

Life Science

Use the following information as well as the Green

and the Miller and Levine

Biology

textbooks to help you answer your part in the jigsaw notes.

What are the 6 types of asexual reproduction?

Binary fission, budding, spore formation, regeneration, vegetative propagation, and cloning.

Binary fission is the simplest form of asexual reproduction. The parent cell simply divides into two parts that

are about equal. Each of the new cells, called daughter cells, becomes a separate individual. The daughter cell

organisms are identical to each other. Each of the new offspring then grows to a normal size. Binary fission is

the usual method of reproduction of one-celled organisms including protozoa, bacteria, and many algae.

Budding is another type of asexual reproduction. New individuals develop as small growths or buds on the

surface of the parent organism. The new organism may break off and live independently or remain attached and

live as a colony. Budding is different from binary fission because the offspring and parent are not the same size;

there is an unequal division of cytoplasm. Yeast, hydra, sponges, and some worts reproduce by budding.

Spores are special cells that some individual organisms produce. A thick, tough outer coating that protects the

inner cell usually surrounds spores. When released by the parent, each spore may grow into a separate

individual. Fungi, algae, and protozoa can reproduce by spore formation.

Regeneration is the ability to re-grow lost body parts. Starfish or sea stars, earthworms, hydra, and planarian

(simple annelids or worms) can regenerate into new individual. A planarian that is cut into several pieces will

regenerate into several new worms. So long as a the ray of a sea star still has some part of the center attached,

it could grow back into an entire new sea star! Lobsters, crabs, and gecko lizards can regenerate new body parts

that may be lost. We do a form of regeneration when we grow new skin over a cut.

Vegetative propagation is new cells separating from the parent and forming a complete, independent

individual. Plants can reproduce asexually by vegetative propagation. Roots, stems, and leaves are called

vegetative structures. Some plants reproduce vegetative by special structures such as bulbs, corms, tubers,

runners, and rhizomes. Farmers and gardeners have taken advantage of different plants' ability to reproduce

asexually for generations. Artificial vegetative propagation allows gardeners and farmers to grow plant with

certain traits. A "cutting" is any vegetative part of the parent plant used to produce a new individual Runners

are stem-like structures that grow above the soil from the parent. When a runner reaches a favorable spot

(enough light, water...) it will grow into a new individual. Examples of plants that reproduce with runners are

strawberries and ivy. Tubers are underground, stem-like structures that expand to form enlarged structures.

These can grow into new, individual plants if the conditions are right that are identical to the parent. From one

tuber, many new plants can form. Example of a tuber would be potatoes and sweet potatoes.

Cloning is a scientifically-engineered reproductive technology that involves infusing the genetic material from

a parent organism in to an (nucleus removed) of another cell. See pg. 427 of LE Biology text

Asexual Reproduction Worksheet Page 4