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Warm-Up Asexual and Sexual Reproduction

Lesson Question

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WK2 Words to Know

Fill in this table as you work through the lesson. You may also use the glossary to help you.

a form of asexual reproduction in which offspring grow from the parts of the parent plant

a type of reproduction in which one parent produces offspring that are genetically identical to itself

a form of asexual reproduction in which a parent breaks into parts that may regenerate into offspring

a form of asexual reproduction in which a new organism grows from the body of the parent

a form of asexual reproduction in which the parent cell divides into two genetically identical cells

a form of asexual reproduction in which a parent releases spores that develop into offspring

Lesson Goals

Explore how organisms reproduce.

Examine thedifferent typesof asexualreproduction.

Analyze the process of sexual reproduction.

Compare andcontrast asexual and sexual reproduction.

Identifythe advantages and

of both asexual andsexual reproduction.

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Warm-Up Asexual and Sexual Reproduction

Mitosis and Meiosis

There are some key differences between mitosis and meiosis.

Mitosis Meiosis

Cell divides to form cells Cell divides to form sex cells

Cells are genetically identical Cells are different

Necessary for some forms of asexual reproduction

Necessary for sexual reproduction

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Asexual and Sexual ReproductionInstruction

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Asexual Reproduction

• In asexual reproduction, parent produces the offspring.

• The offspring are genetically identical to the .

• In asexual reproduction, cell division ensures that offspring receive

the correct number of .

Budding

• Budding is a form of reproduction in which offspring

begin as a small bud on the parent.

• Some sponges reproduce by budding.

• is necessary for budding.

• In budding, the new organism is attached to the parent.

• In most cases, the new eventually separates from the parent.

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Asexual and Sexual ReproductionInstruction

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Fragmentation

• Fragmentation is a form of asexual reproduction in which offspring may

develop from of the parent.

• Some worms, , and sea stars reproduce by fragmentation.

• Some or all of the pieces from the parent’s body can develop into .

• Fragmentation must be followed by regeneration.

Binary Fission

• Binary fission is a form of asexual reproduction

in which a parent cell to form two identical cells.

• such as bacteria reproduce

by binary fission.

• Binary fission begins with replication.

• During binary fission, the cell gets longer, the copied DNA separates, and two identical cells are formed.

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Asexual and Sexual ReproductionInstruction

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Sporulation

• Sporulation is a form of asexual reproduction in which new organisms

develop from .

• Mushrooms and reproduce by sporulation.

• In sporulation, the parent produces spores.

• Spores are released and divide by mitosis into new organisms.

Vegetative Propagation

• Vegetative propagation is a form of asexual reproduction in which offspring

grow from a plant.

• Vegetative propagation occurs only in

.

• Vegetative propagation can be

or .

Sexual Reproduction

• Sexual reproduction requires two parents in order to produce .

• The offspring are genetically from the parents.

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Asexual and Sexual ReproductionInstruction

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Fertilization

• During fertilization:

• egg and join.

• a is formed.

• The zygote develops into a new organism

through mitosis and cell .

Asexual vs. Sexual Reproduction

Asexual Reproduction Sexual Reproduction

Requires parent Requires parents

The offspring receive all DNA from a single parent.

The offspring receive half of their DNA from each parent.

The offspring have the same

as the parent.

The offspring do not have the same DNA as either parent.

Involves cell division that is similar to mitosis

Involves the joining of sex cells, which

are formed during

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Asexual and Sexual ReproductionInstructionSlide

Advantages and Disadvantages of Asexual and Sexual Reproduction

Asexual Reproduction Sexual Reproduction

Advantages

Requires energy Variation in

Is Less competition for resources

Disadvantages

No variation in DNA Requires energy

More

for resources

Is

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Summary Asexual and Sexual Reproduction

Answer

Review: Key Concepts

• Asexual reproduction:

• requires one parent and results in offspring that have the same DNA.

• includes budding, binary fission, , sporulation, and vegetative reproduction.

• involves division (either through mitosis or a similar process).

• Sexual reproduction:

• requires two parents and results in offspring that receive half their DNA from each parent.

• involves of the egg by the sperm, which are formed

during meiosis.

Lesson Question How do organisms reproduce??

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Summary Asexual and Sexual Reproduction

Review: Key Concepts

Asexual Reproduction Sexual Reproduction

Advantages

Requires less energy Variation in DNA

Is faster competition for

resources

Disadvantages

No variation in DNA Requires more

competition

for resources

Is slower

Use this space to write any questions or thoughts about this lesson.

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