Classification

• What should you be able to describe by the end of the video on organism classification?


  You should be able to describe how organisms are classified based on their characteristics, the three domain classification system, and use an evolutionary tree to describe relationships between organisms.
• Why did scientists realize the need for classification of species?


  Scientists realized that many species have characteristics in common.
• What classification system did Carl Linnaeus develop?


  • Divided organisms into two kingdoms: Animalia and Plantae
  • Further divided into categories: kingdom, phylum, class, order, family, genus, species
• What mnemonic can help remember the classification categories developed by Linnaeus?

  The mnemonic is "King Phillip came over for good soup."
• If given a classification of an organism with a missing part, what might you be asked to fill in?


  You might be asked to fill in the missing classification category, such as class.
• What is the binomial naming system?


  It is a system where every organism is named using its genus and species.
• What is the binomial name for the zebra?


  The binomial name for the zebra is Equus quagga.
• What is the binomial name for the polar bear?


  The binomial name for the polar bear is Ursus maritimus.
• What is a key fact about Linnaeus's classification system?

  It is based on observable characteristics such as body shape or number of toes.
• What major advances in biology have occurred since Linnaeus's time?


  Scientists can now use microscopes to examine internal structures and analyze biochemistry, including DNA.
• What are the three domains in the three domain classification system?


  1. Archaea: Primitive bacteria often found in extreme conditions
  2. Bacteria: True bacteria, such as those in the human digestive system
  3. Eukaryota: Includes animals, plants, fungi, and protists like amoeba
• How do scientists use evolutionary trees?


  Scientists use evolutionary trees to show how closely related organisms are to each other.
• What data do scientists use to create evolutionary trees for living organisms?


  Scientists use classification data and DNA analysis to create evolutionary trees for living organisms.
• What challenges do scientists face when creating evolutionary trees for extinct organisms?


  Scientists face challenges due to incomplete fossil records of many species.
• What does it indicate if species one and two are closely related on an evolutionary tree?


  It indicates that species one and two share a more recent common ancestor compared to species three.
• What is a common ancestor in the context of evolutionary trees?


  A common ancestor is a species from which two or more species have evolved.