Evolution cladogram

Time SYNOPSIS Students prepare the components for building a Colossal Classroom Cladogram of vertebrate evolution, then put it together, showing the gradual, mosaic accumulation of the traits which we, as humans, possess. A follow-up discussion helps focus on these concepts.

Evolution cladogram

Time SYNOPSIS Students prepare the components for building a Colossal Classroom Cladogram of vertebrate evolution, then put it together, showing the gradual, mosaic accumulation of the traits which we, as humans, possess.

A major purpose of this is to dramatize the evidence that we and in fact all living things didn't suddenly pop into existence, but clearly evolved as an accumulation of traits over vast periods of time. A follow-up discussion helps focus on these concepts. Transitional forms are generally a mosaic mix of "ancestral" and "derived" features; that is, some traits evolve faster than others, so each transitional is typically a mix of older and newer traits.

The groups-within-groups hierarchical pattern of Linnaean classification is a result of both extinction and branching from common ancestors. The fossil record, as expected, has many gaps, for several good reasons.

Human Evolution Cladogram by Hyung Jun Kim on Prezi

There are many excellent sequences of fossils clearly showing transitions from one form to another. Any given group of organisms possesses a collection of traits which individually accumulated over time. In one sense, "Macroevolution" is simply an accumulation of microevolutionary changes over long periods of geological time.

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These pages are also available in PDF format at the end of this lesson.

Evolution cladogram

Time-strip mounted diagonally on wall, with 10 vertical strips and labels handy as students build cladogram. Team Assignment Strips two pageseach with an animal Group Name and the time that group First Appeared one per team of Groups of Traits one pageeach cluster associated with the first appearance of a new group clade.

The clusters are arranged randomly and identified with the names of colors to avoid any clues of sequence. Background Information packet for students.

Illustration Resources list 2 pages, print 1 sheet BTB [back to back] 7. Books, internet access, for students to research the animal groups see a few online resources on the Resources list. Team Assignment Strips, with Associated Traits for teacher only.

This is available only in PDF format end of lesson. Students should actually do these, but you could show them one as an example.

Cladogram Definition

Team Assignment Strips enough for one strip per student 2. Groups of Traits - 1 page one per student 3.

Procedures - 1 page one per student; could be printed BTB with item 2 4. Background Information packet - pages one packet per student 5. Try our Patterns in Time lesson, where students develop a more realistic understanding of deep time, along with the realization that the different vertabrate classes emerged separately over several s of millions of years, and did not exist prior to their emergence as revealed in the fossil record.

Evolution: Synapomorphies & Cladogram - SchoolWorkHelper

That lesson also demonstrates the accumulation of modified traits on top of the accumulated traits found in the previously emerged group, showing gradual, additive and mosaic changes over time.

All of this provides a strong implication that each group descended from the earlier antecedents through gradual change over time.

The Big Cladogram lesson probably works best near the end of your unit on classification. Lay out a narrow strip of paper e.

With a meter stick, mark the following distances from that first mark each cm representing 1 million years ago: You can use a shorter strip if space is a problem, but you will need to re-scale, and the spaces at the "NOW" end will be very crowded!Biologists use cladograms and phylogenetic trees to illustrate relationships among organisms and evolutionary relationships for organisms with a shared common ancestor.

Evolution: Synapomorphies & Cladogram Divergent and Convergent Pathways Once a new species forms, its evolutionary pathway may diverge from the original species. Students prepare the components for building a Colossal Classroom Cladogram of vertebrate evolution, then put it together, showing the gradual, mosaic accumulation . Biologists use cladograms and phylogenetic trees to illustrate relationships among organisms and evolutionary relationships for organisms with a shared common ancestor.

A cladogram is not, however, an evolutionary tree because it does not show how ancestors are related to descendants, nor does it show how much they have changed; many evolutionary trees can be inferred from a single cladogram. Evolutionary trees depict clades.

A clade is a group of organisms that includes an ancestor and all descendants of that ancestor. You can think of a clade as a branch on the tree of life.

Some examples of clades are shown on the tree below. Evolutionary trees depict clades. A clade is a group of organisms that includes an ancestor and all descendants of that ancestor.

You can think of a clade as a branch on the tree of life. Some examples of clades are shown on the tree below. Evolution: Synapomorphies & Cladogram Divergent and Convergent Pathways Once a new species forms, its evolutionary pathway may diverge from the original species.

Transcript of Human Evolution Cladogram The first discovery of Afarensis goes back to , starting from the discovery of the canine in Tanzania, Laetoli by Louis Leaky and to the most important discovery of the Lucy, one of the most perfect skeleton frames of adult Afarensis, in Ethiopia, Hadar in by Dan Johansol.

Lesson: evolution: Classroom Cladogram of Vertebrate/Human Evolution