IB Biology Topic A3.1.15 Identification of Species from Environmental DNA in a Habitat Using Barcodes Revision Notes (HL)

IB Biology Topic A3.1.15 Identification of Species from Environmental DNA in a Habitat Using Barcodes Revision Notes (HL) | RevisionDojo

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DNA Barcodes and Environmental DNA Enable Non-Invasive Species Identification

Definition

DNA Barcodes

DNA barcodes are short, standardized DNA sequences unique to each species, much like product barcodes in a store. These genetic "fingerprints" enable species identification, even from small or incomplete samples.

Traditional identification of species often depends on morphological features (e.g., flower shape, body markings).
Many organisms are hard to identify: plants without flowers, insect larvae, or rare animals that leave only traces behind.
DNA barcoding and environmental DNA (eDNA) provide a modern method for rapid and accurate species identification.

Example

A feather found in a forest can be analyzed for its DNA.
By amplifying the COI gene using polymerase chain reaction (PCR) and comparing it to a reference database, scientists can identify the bird species, regardless of visual evidence.

Environmental DNA Allows Species Detection From Trace DNA in Water, Soil, and Air

Definition

Environmental DNA (eDNA)

Environmental DNA (eDNA) refers to genetic material shed by organisms into their surroundings through skin cells, mucus, feces, or other biological materials. It enables species detection without direct observation.

eDNA Identification Involves Collection, Extraction, Amplification, and Sequencing

Imagine investigating a pond's biodiversity:

Sample Collection: Collect water, soil, or air samples from the environment.
DNA Extraction: Use chemical and physical methods to isolate DNA.
Amplification: Amplify barcoding regions using PCR to increase detectable DNA.
Sequencing: Sequence the amplified DNA to read its genetic code.

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Definition

Paywall

(on a website) an arrangement whereby access is restricted to users who have paid to subscribe to the site.

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Lorem ipsum dolor sit amet, consectetur adipiscing elit. Sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat.

Duis aute irure dolor in reprehenderit

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Note

Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam quis nostrud exercitation.

Excepteur sint occaecat cupidatat non proident

Nemo enim ipsam voluptatem quia voluptas sit aspernatur aut odit aut fugit, sed quia consequuntur magni dolores eos qui ratione voluptatem sequi nesciunt. Neque porro quisquam est, qui dolorem ipsum quia dolor sit amet, consectetur, adipisci velit.

Tip

Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat.

Lorem ipsum dolor sit amet, consectetur adipiscing elit.
Sed do eiusmod tempor incididunt ut labore et dolore magna aliqua.
Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris.
Duis aute irure dolor in reprehenderit in voluptate velit esse cillum.

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DNA Barcodes and Environmental DNA Enable Non-Invasive Species Identification

Definition

DNA Barcodes

Traditional identification of species often depends on morphological features (e.g., flower shape, body markings).
Many organisms are hard to identify: plants without flowers, insect larvae, or rare animals that leave only traces behind.
DNA barcoding and environmental DNA (eDNA) provide a modern method for rapid and accurate species identification.

Example

A feather found in a forest can be analyzed for its DNA.
By amplifying the COI gene using polymerase chain reaction (PCR) and comparing it to a reference database, scientists can identify the bird species, regardless of visual evidence.

Environmental DNA Allows Species Detection From Trace DNA in Water, Soil, and Air

Definition

Environmental DNA (eDNA)

eDNA Identification Involves Collection, Extraction, Amplification, and Sequencing

Imagine investigating a pond's biodiversity:

Sample Collection: Collect water, soil, or air samples from the environment.
DNA Extraction: Use chemical and physical methods to isolate DNA.
Amplification: Amplify barcoding regions using PCR to increase detectable DNA.
Sequencing: Sequence the amplified DNA to read its genetic code.

Definition

Paywall

(on a website) an arrangement whereby access is restricted to users who have paid to subscribe to the site.

anim nostrud sit dolore minim proident quis fugiat velit et eiusmod nulla quis nulla mollit dolor sunt culpa aliqua

Duis aute irure dolor in reprehenderit

Note

Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam quis nostrud exercitation.

Excepteur sint occaecat cupidatat non proident

Tip

Lorem ipsum dolor sit amet, consectetur adipiscing elit.
Sed do eiusmod tempor incididunt ut labore et dolore magna aliqua.
Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris.
Duis aute irure dolor in reprehenderit in voluptate velit esse cillum.

A - Unity and Diversity9 subtopics

B - Form and Function10 subtopics

C - Interaction and Interdependence9 subtopics

D - Continuity and Change12 subtopics

IB Biology Topic A3.1.15: Identification of Species from Environmental DNA in a Habitat Using Barcodes Notes

DNA Barcodes and Environmental DNA Enable Non-Invasive Species Identification

Environmental DNA Allows Species Detection From Trace DNA in Water, Soil, and Air

eDNA Identification Involves Collection, Extraction, Amplification, and Sequencing

anim nostrud sit dolore minim proident quis fugiat velit et eiusmod nulla quis nulla mollit dolor sunt culpa aliqua

Duis aute irure dolor in reprehenderit

Excepteur sint occaecat cupidatat non proident

Unlock the rest of this chapter with a free account

DNA Barcodes and Environmental DNA Enable Non-Invasive Species Identification

Environmental DNA Allows Species Detection From Trace DNA in Water, Soil, and Air

eDNA Identification Involves Collection, Extraction, Amplification, and Sequencing

anim nostrud sit dolore minim proident quis fugiat velit et eiusmod nulla quis nulla mollit dolor sunt culpa aliqua

Duis aute irure dolor in reprehenderit

Excepteur sint occaecat cupidatat non proident

Unlock the rest of this chapter with a free account

A - Unity and Diversity9 subtopics

B - Form and Function10 subtopics

C - Interaction and Interdependence9 subtopics

D - Continuity and Change12 subtopics