Survey
* Your assessment is very important for improving the workof artificial intelligence, which forms the content of this project
Download Asexual vs. Sexual Reproduction
Document related concepts
Transcript
Asexual vs. Sexual Reproduction Mrs. Kilkenny Asexual reproduction • 1 parent. • The primary form of reproduction for singlecelled organisms such as archaea, bacteria, and protists. • Some plants and fungi reproduce asexually as well. Sexual Reproduction • 2 parents • Results in increasing genetic diversity of the offspring. • Characterized by two processes: • meiosis, halving of the number of chromosomes • fertilization, combining two sex cells (can be internal or external) • Primary method of reproduction for most visible organisms, including almost all animals and plants. Binary Fission • Asexual • Cell splits and replicated DNA goes with each part • Prokaryotes, Bacteria • + Fast and easy • - Everybody has the same DNA Bacterial Conjugation • Does not produce offspring, changes parent. • A bacteria shoots out a tube and sends a piece of its DNA to another bacteria • Some types of bacteria • + Mixes DNA • - Takes energy Fragmentation/ Regeneration • Asexual • Body of parent breaks and produces offspring • Fungi, moss, sea stars, planarian • + Easy • - Parent broken, same DNA Fragmentation/ Regeneration Budding • Asexual • Offspring grows out of parent • Yeast, hydras • + Fast, somewhat easy • - Same DNA Pollination • Sexual • Pollen is delivered to female part of plant • Flowering plants • + Plants don’t have to move, mixes DNA • - Need external source for pollination to take place; wind, bee, bat, butterfly etc. Pollination Reproductive Strategies Relative Complexity: What is it? Singlecelled, multi-cellular? Plant, animal? DESCRIBE THE ORGANISM Number of parents: 1 or 2???? Reproductive mechanism: How do they do the deed? Parental Care: Do they take care of their young? For how long? Genetic Variation: Diverse? Or Clone?
