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Lesson 5: Genetics and Reproduction

Lesson 5: Genetics and Reproduction. Objective #1- Compare the advantages of sexual reproduction and asexual reproduction in different situations. Hereditary information (DNA) is passed on through reproduction.

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Lesson 5: Genetics and Reproduction

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  1. Lesson 5: Genetics and Reproduction Objective #1- Compare the advantages of sexual reproduction and asexual reproduction in different situations.

  2. Hereditary information (DNA) is passed on through reproduction • Reproduction is a process that makes new organisms from one or more parent organisms. • A species must pass on its DNA to the next generation to thrive.

  3. There are 2 forms of reproduction: • Sexual reproduction • the joining of cells (gametes) from two parents to form an individual that is genetically different from parents • Example- sperm and egg

  4. 2) Asexual reproduction production of genetically identical offspring from a single parent • a- means “without” • Similar to cloning

  5. Asexual reproduction • Mostly prokaryotes (bacteria) but some eukaryotes such as protists, fungi, and plants • There are 3 similar types of asexual reproduction • Binary fission • Spore formation • Budding

  6. Most common type of asexual reproduction DNA replication followed by division into 2 equal parts Binary fission

  7. Spore formation • Used mostly by fungi (puff balls) • DNA replication within cell and then covered by protective covering until parent cell later bursts and releases identical spores • Example- Anthracis bacillus

  8. Similar to binary fission except that a single daughter cell is produced from an outgrowth on a larger parent cell Example- Hydra Budding

  9. More efficient- if species is thriving then why change? All organisms can potentially reproduce No need to attract a mate In changing conditions, no genetic variability can lead to death of population Example- food crops suited to certain weather but then it changes = no food! Advantages and Disadvantages

  10. Summary Assignment • Graphic Organizer: Asexual vs. Sexual Reproduction • Read pg. 149 • Find 3 advantages and 1 major disadvantages to both sexual and asexual reproduction.

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