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Name:
Date:
CIS 339, Class ______
Science- Ms. Sowin
Aim # 5: How do plants and animals reproduce asexually?
Mini-Lesson Notes to copy in notebook:
Asexual Reproduction: One parent makes identical offspring by itself
Class Work # 5- Read and answer the questions in full sentences!
Under suitable conditions, some bacteria
reproduce every twenty minutes. Bacteria are singlecelled organisms. To reproduce, they simply divide into
two by mitosis to form two new individuals. Each
offspring is identical to the parent. Reproduction that involves
one parent and produces offspring with the same genetic makeup as the
parent is asexual reproduction. The pictures above show how bacteria
reproduces on a human’s hand.
There are other forms of asexual reproduction in
animals. For example, hydra are tiny freshwater animals that
reproduce by budding. Small buds grow from the sides of an
adult. When the bud on the adult becomes large enough, it
breaks off and become new hydra. In addition, animals such
as flatworms, sponges, sea stars and starfish can split into
two or more pieces and grow into new individuals. If these
organisms break into pieces, a whole new organism will grow
from
each piece!
Some plants can also reproduce asexually. A strawberry plant
produces stems, called runners, that stretch out along the ground instead of
upward. Buds along the stems grow into new plants that quickly grow their
own roots. Some plants, such as geraniums or sweet potato plants, can
reproduce from stem or leaf cuttings that are placed in water. Stems,
leaves, and roots of asexually reproducing plants all have the same
hereditary information.
1. How does mitosis help bacteria reproduce?
Mitosis helps bacteria reproduce because one bacteria cell divides into two.
2. What is asexual reproduction?
Asexual reproduction is when one parent makes identical offspring by itself.
3. Give an example and describe how an animal can asexually reproduce.
Animals like flatworms, sponges, sea stars, and starfish can split into two or
more pieces to make more identical off spring.
4. Infer what would happen if someone cut sea stars and starfish into pieces
and threw them back into the ocean.
The sea stars and starfish would just rejuvenate itself.
5. Infer from the picture of strawberry plants how the genetic material in
the small strawberry plant above compares to the genetic material in the
large strawberry plant.
(Hint: would they have the same or different genetic material?)
6. What do bacteria, hydra, starfish, strawberries, and potatoes all have in
common?
They all can asexually reproduce
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