- Slides: 30
REPRODUCTION Sexual and Asexual
Reproduction – the process of living things producing the same type of living thing. Examples – horses produce horses, humans produce humans, and tomato plants produce tomatoes. * Like produces like. There are two types of reproduction: asexual and sexual
Asexual Reproduction Living things that reproduce from only one parent. Examples: Regeneration, budding, and cellular division.
Advantages of Asexual Reproduction: • animals that live in one place & unable to look for mates reproduce asexually. • numerous offspring can be produced without a great amount of energy or time. • One single organism can start new colonies in new locations. • Mating partners are not needed to be found. • More reliable (less to go wrong in cell division)
Disadvantages of Asexual Reproduction: • Species may not be able to adapt to a changing environment
Crown of Thorns Story
Regeneration (ex. starfish)
Can humans regenerate body parts by asexual reproduction?
Regeneration (ex. Planaria)
Budding (ex: Hydra)
Cellular Division (also called Binary Fission) • Protozoa
Binary Fission (ex. paramecium)
Binary Fission (ex. bacteria)
Asexual Reproduction in Plants • Propagation-transplanting parts of a plant to a new growing area (ex. Rhizomes, runners, bulb formation, rooting from stems) • Budding-tiny bud growing off parent plant (ex. Potato “eyes”, branches budding) • Spores-reproductive cells that produce a new organism (ex. Ferns, mushrooms, molds)
Sexual Reproduction Sexual reproduction usually requires two parents (partners). Examples: frogs, deer, bats, humans, and flowers.
Surinam Toad • http: //www. youtube. com/watch? v=m. Z 7 b 4 spj. Xhw
Advantages of Sexual Reproduction: • The offspring will be different than its parents. This allows the species to adapt to its surroundings.
Galapagos Finches • http: //www. youtube. com/watch? v=l 25 MBq 8 T 77 w
Disadvantages of Sexual Reproduction: • Often slower than asexual reproduction, and less reliable (more mutations, problems) • Much energy is used in mating processes • http: //videos. howstuffworks. com/animal-planet/28366 -fooled-by-nature-bowerbirds-seduction-video. htm • Can’t always find suitable mate
TWO TYPES OF REPRODUCTION • 1. Internal Fertilization • 2. External Fertilization
Internal Fertilization • Conjugation- Sexual reproduction between microscopic organisms Asexual budding
External Fertilization • Sex cells are dispersed out of the body in water • Examples: fish, salamanders, jellyfish
Meiosis • Produces sex cells only (sperm or egg cells) • Takes place in the reproductive organs of organisms that reproduce sexually.