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Methods of Sexual Reproduction

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A P

on 5 April 2017

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Transcript of Methods of Sexual Reproduction

Methods of Sexual Reproduction
1) Conjugaton:
Occurs when two single-celled organisms transfer or exchange some genetic material.
Used by some bacteria.
Used by some protists
2) Hermaphrodites:
An organism that produces both male and female sex cells in the same individual.
3) Flowering Plants (Hermaphrodites)
Most plants exchange genetic material (move sperm from male structures to female structures) through a process called
pollination
.
Pollinators: Organisms or elements that move pollen (plant sperm) from male reproductive structures to female reproductive structures.
How do plants exchange
genetic material?
4) Separate Sexes:
Females produce eggs and males produce sperm. In order to combine genetic material a sperm cell has to combine with an egg cell.
In animals that have separate sexes, there are two methods of fertilization.
A) External Fertilization:
The sperm and egg unite outside the body. This method of fertilization is most often used by aquatic animals.
B) Internal Fertilization:
The union of the sperm and egg cell occur inside the females body.
Four Facts
1) The embryo develops and is nourished inside the mothers body.
2) Most parents continue to protect their young for months or years.
3) A high percentage off offspring survive.
4) Only a few zygotes produce.
Four Facts:
1) The embryo develops outside the mother.
2) Most parents do not protect their young from danger.
3) A high perentage of young do not survive.
4) Lots of zygotes produced.
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