Asexual Reproduction

​Asexual Reproduction

Mr. K

Multiple Choice

DNA stands for....

• Deoxyribonevermind

• Eoxyribonucleic acid

• Deoxyribonuclase acid

• Deoxyribonucleic acid

​Asexual Reproduction

We looked last week at mitosis as a process to allow single cells to reproduce themselves.

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​Today we are going to look at how single cellular organisms use mitosis to create offspring!

Asexual Reproduction in Single Cell Organisms

• A SINGLE organism generates an offspring with identical characteristics.

• The conditions for why an organism reproduces asexually rests on it's environment.

Binary Fission

A form of asexual reproduction used by a single celled organism that does not have a nucleus

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A parent cell will divide so that each new cell contains a single chromosome

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Mitosis and Binary Fission are not the same as do not have a nucleus, it does not under go PMAT​

Multiple Choice

What is a factor for a cell to reproduce asexually or sexually?

• Ecology

• Geography

• Environment

• Minecraft Servers

Asexual Reproduction (Budding and Sporulation)

A form of reproduction where a new organism grows on the original. ​Separating only when mature

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Budding

Budding: Yeast cells are a great example for budding.

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A copy of the nucleus is created and a tiny bud appears on the cell wall. The bud will grow and eventually break off to form a new yeast cell taking away the copy of the nucleus.

Sporulation

Moulds such as Rhizopus (Bread Mould)

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Spores are produced in structures called sporangium's. These sporangium's host spores until the organism finds itself in favourable conditions.

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Poll

How many wish I had more questions in these presentations?

• Me

• Nah

• Whatever

• ....

Multiple Choice

LETS GOOOOOO - what organism is a great example for asexual reproduction via budding...

• Carrots

• Ducks

• Rhizopus

• Yeast

​Asexual Reproduction in Animals

​Animals are either vertebrates (with a spine) or invertebrates (without a spine)

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​Various invertebrates reproduce asexually!

• ​Sponges and hydra will reproduce by budding

• Planaria will reproduce via binary fission

Advantages of Asexual Reproduction

Allows stationary organisms to reproduce

Allows reproduction with minimum expenditure of energy

Prevents genetic change that might be a disadvantage to the offspring for survival means.

Disadvantages

Forms of asexual reproduction can be very wasteful. As an example spore production, not all offspring survive

Can lead to overcrowding and competition

No genetic variation to allow for adaptation. Meaning that if an environment changes then the organisms may be at risk of ​dying off.

​Conclusion

Its interesting that even at the cellular level we see how organisms REQUIRE a previous organism to reproduce... Even at the level of single cellular organisms the information that each living organism contains is necessary for it to successfully reproduce... where did this information come from? Why does one bud, one sporulate, one fragement? What mechanisms are present to tell the organism what to do.

Open Ended

Give a disadvantage and an advantage to asexual reproduction...