Fossil record What are fossils? Fossils are
Description: Fossil record What are fossils? Fossils are remains of ancestral forms of organisms that were preserved in naturally occurring materials such as sedimentary rocks over a long period of time. The study of fossils is called paleontology
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slide1. Fossil record What are fossils?
Fossils are remains of ancestral forms of organisms that were preserved in naturally occurring materials such as sedimentary rocks over a long period of time.
The study of fossils is called paleontology
Petrifaction is process by which hard plant/animal parts change in to rock i.e bones, teeth, shells and woody stems
They give a direct evidence of what existed at aparticular geological era<br>
slide2. Importance of fossil records
Give evidence of type of plants and animals that existed long ago.
Give evidence of structural changes that have taken over a long period of time.
Limitations of fossil records
Rapid decomposition of dead organisms cannot fossilize/soft parts cant fossilize/scavenging animals
Missing links
Distortion of parts during sedimentation
Destruction of fossils by geological activates like volcanic eruptions
Sudden appearance of new species in absence of intermediate.<br>
slide3. Comparative embryology Vertebrate embryos have similar morphological features during their early developmental stages which suggest a common ancestry.
Birds are more closely related to humans since their embryos have a lot of morphological similarities.<br>
slide4. Comparative anatomy Members of a phylum show similarities in structural organs performing the same function hence have a common ancestry.
Importance of comparative anatomy
It gives evidence of a common ancestry of a group of organisms
Comparative anatomy is classified into two groups;-
Convergent evolution
Divergent evolution<br>
slide5. What is meant by convergent evolution?
Convergent evolution is the process where different structures of different embryonic origin evolve to perform same function.
What is divergent evolution?
Divergent evolution is a process whereby structures with a common embryonic origin evolve to perform.<br>
slide6. Cell biology Organisms having same chemicals such as nucleic acids and organelles such as mitochondria have a common ancestry
All vertebrates have a common ancestry since they all contain organelles like mitochondria and ribosome.<br>
slide7. Comparative serology Organisms with similar blood proteins/similar antibody antigen reactions have a common ancestry.<br>
Fossils are remains of ancestral forms of organisms that were preserved in naturally occurring materials such as sedimentary rocks over a long period of time.
The study of fossils is called paleontology
Petrifaction is process by which hard plant/animal parts change in to rock i.e bones, teeth, shells and woody stems
They give a direct evidence of what existed at aparticular geological era<br>
slide2. Importance of fossil records
Give evidence of type of plants and animals that existed long ago.
Give evidence of structural changes that have taken over a long period of time.
Limitations of fossil records
Rapid decomposition of dead organisms cannot fossilize/soft parts cant fossilize/scavenging animals
Missing links
Distortion of parts during sedimentation
Destruction of fossils by geological activates like volcanic eruptions
Sudden appearance of new species in absence of intermediate.<br>
slide3. Comparative embryology Vertebrate embryos have similar morphological features during their early developmental stages which suggest a common ancestry.
Birds are more closely related to humans since their embryos have a lot of morphological similarities.<br>
slide4. Comparative anatomy Members of a phylum show similarities in structural organs performing the same function hence have a common ancestry.
Importance of comparative anatomy
It gives evidence of a common ancestry of a group of organisms
Comparative anatomy is classified into two groups;-
Convergent evolution
Divergent evolution<br>
slide5. What is meant by convergent evolution?
Convergent evolution is the process where different structures of different embryonic origin evolve to perform same function.
What is divergent evolution?
Divergent evolution is a process whereby structures with a common embryonic origin evolve to perform.<br>
slide6. Cell biology Organisms having same chemicals such as nucleic acids and organelles such as mitochondria have a common ancestry
All vertebrates have a common ancestry since they all contain organelles like mitochondria and ribosome.<br>
slide7. Comparative serology Organisms with similar blood proteins/similar antibody antigen reactions have a common ancestry.<br>