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Whales[1]11222
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  • Notes Inheritance passes all the complex information required to develop a human being from parents to fertilised egg. Much of this information is the same e.g. the same organs are usually produced in the same place. Image details Large crowd of people – looking up. (Corbis)
  • Notes Very subtle differences exist in some of the information we receive, producing unique individuals. Image details Couple with newborn. ( Ariel Skelley/Corbis)
  • Notes Brothers and sisters aren’t identical (except for identical twins), so even people with the same parents must still get a unique combination of information from their parents. Image details Computer artwork of a human sperm approaching an egg during the process of fertilisation. ( Mehau Kulyk/Science Photo Library)
  • Notes To fit the complex information into such a small space, it must be carried as chemical molecules. Image details Light micrograph of a human egg cell after fertilization. (Richard G. Rawlins/Custom Medical Stock/Science Photo Library)
  • Notes Genes are made of a chemical called DNA (deoxyribonucleic acid). This is a chemical code carrying the information needed to make a human being, in a similar way that letters in the alphabet form a code that we read as words. Image details Illustration of nucleus  chromosomes  genes, showing that each chromosome in the nucleus contains thousands of genes. (IFA Design/Oxford University Press)

Transcript

  • 1. WHALES Done by: Saif
  • 2.
    • Whales are mammals.
    • All mammals share some features.
  • 3.
    • Whales belong to a group of mammals called the Cetacean.
    • Cetaceans have two features that other mammals don’t have.
  • 4.
    • Cetaceans are split into four groups.
    No Cetacean group Baleen plates? Teeth? Echo-location? Baleen Sperm Other toothed Beaked Yes No No No Teeth in lower jaw only Many teeth Few teeth No Yes Yes Yes
  • 5.  
  • 6.
    • From the evidence so far, baleen whales are more different.
    • There are 11 species of baleen whale.
    • They include blue whales and sperm whales.
  • 7. Q5, Q6
    • But in the 1990s new evidence was found.
    • Scientists looked at DNA from 16 species of cetaceans.
    • The DNA showed that:
    • - Sperm whales were more closely related to baleen whales than other groups.
    • - Beaked whales are only distantly related to any of the other groups.
  • 8. The End