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Enduring understanding 1.B

Organisms are linked by lines of descent from common ancestry.
by

Mrs. P

on 23 September 2014

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Transcript of Enduring understanding 1.B

Enduring understanding 1.B:
Organisms are linked by
lines of descent from common ancestry.

Organisms share many conserved core processes and features that are widely
distributed among organisms today.

These processes provide evidence that
all organisms (Archaea, Bacteria, and Eukarya, both extant and extinct)
are linked by lines of descent from common ancestry.

Elements that are conserved across all domains of life are DNA and RNA as carriers of genetic information, a universal genetic code, and many metabolic pathways.

The existence of these properties in organisms today implies that they were
present in a universal ancestor and that present life evolved from a universal
ancestor.

Phylogenetic trees graphically model evolutionary history and can
represent both acquired traits and those lost during evolution.
Essential knowledge 1.B.1: Organisms share many conserved core
processes and features that evolved and are widely distributed among
organisms today.
a. Structural and functional evidence supports the relatedness of all
domains.


1. DNA and RNA are carriers of genetic information through
transcription, translation and DNA replication.

2. Major features of the genetic code are shared by all modern
living systems.
* ex: A, T/U, C, G nucleotides

3. Metabolic pathways are conserved across all currently recognized domains.
* ex: glycolysis of respiration is performed by ALL organisms
b. Structural evidence supports the relatedness of all eukaryotes. [See
also 2.B.3, 4.A.2]
Learning Objectives:

LO 1.14 The student is able to pose scientific questions that correctly identify essential properties of shared, core life processes that provide insights into the history of life on Earth. [See SP 3.1]

LO 1.15 The student is able to describe specific examples of conserved core biological processes and features shared by all domains or within one domain of life, and how these shared, conserved core processes and features support the concept of common ancestry for all organisms. [See SP 7.2]

LO 1.16 The student is able to justify the scientific claim that organisms share many conserved core processes and features that evolved and are widely distributed among organisms today. [See SP 6.1]
In eukaryotes, conserved core elements provide evidence for evolution.

These features include:
* the presence of a cytoskeleton -a network of structural proteins that facilitate cell
movement, morphological integrity and organelle transport
* membrane-bound organelles (ex: nucleus, mitochondria, endoplasmic reticulum, golgi body, chloroplasts)
* linear chromosomes, &
* endomembrane
systems (including nuclear envelope) for macromolecule production)
Full transcript