IB Biology Topic D3.2.8 Single-nucleotide Polymorphisms and Multiple Alleles in Gene Pools Revision Notes (SL/HL)

IB Biology Topic D3.2.8 Single-nucleotide Polymorphisms and Multiple Alleles in Gene Pools Revision Notes (SL/HL) | RevisionDojo

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A Gene Pool Holds Every Allele in a Population

A gene pool is the sum of all alleles present in every member of a population.
Each individual carries only two alleles per gene, but the population as a whole can hold many different alleles, which are the different versions of that gene.

Definition

Gene pool

The total collection of all alleles present in a population.

SNPs Are Single-Base Differences That Create New Alleles

A single-nucleotide polymorphism (SNP) is a position in the genome where a single base pair differs between individuals in a population.
A SNP can change the amino acid a codon specifies, which produces a new allele of the gene.
Millions of SNPs are scattered across the human genome, and together they make each person genetically unique.

Tip

SNPs are used in genetic studies to track inheritance patterns.
They also help identify genes linked to specific diseases.

A Population Can Hold Many More Than Two Alleles

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A Gene Pool Holds Every Allele in a Population

A gene pool is the sum of all alleles present in every member of a population.
Each individual carries only two alleles per gene, but the population as a whole can hold many different alleles, which are the different versions of that gene.

Definition

Gene pool

The total collection of all alleles present in a population.

SNPs Are Single-Base Differences That Create New Alleles

A single-nucleotide polymorphism (SNP) is a position in the genome where a single base pair differs between individuals in a population.
A SNP can change the amino acid a codon specifies, which produces a new allele of the gene.
Millions of SNPs are scattered across the human genome, and together they make each person genetically unique.

Tip

SNPs are used in genetic studies to track inheritance patterns.
They also help identify genes linked to specific diseases.

A Population Can Hold Many More Than Two Alleles

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 D3.2.8: Single-nucleotide Polymorphisms and Multiple Alleles in Gene Pools Notes

A - Unity and Diversity9 subtopics

B - Form and Function10 subtopics

C - Interaction and Interdependence9 subtopics

D - Continuity and Change12 subtopics

A Gene Pool Holds Every Allele in a Population

SNPs Are Single-Base Differences That Create New Alleles

A Population Can Hold Many More Than Two Alleles

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Duis aute irure dolor in reprehenderit

Excepteur sint occaecat cupidatat non proident

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A Gene Pool Holds Every Allele in a Population

SNPs Are Single-Base Differences That Create New Alleles

A Population Can Hold Many More Than Two Alleles

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