IB Biology Topic D3.2.13 Pedigree Charts to Deduce Patterns of Inheritance of Genetic Disorders Revision Notes (SL/HL)

IB Biology Topic D3.2.13 Pedigree Charts to Deduce Patterns of Inheritance of Genetic Disorders Revision Notes (SL/HL) | RevisionDojo

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Pedigree Charts Reveal How a Trait Is Inherited

Pedigree charts map a trait through a family to show whether it is dominant or recessive, and autosomal or sex-linked.
They are especially useful for human genetic disorders, where controlled breeding experiments are not possible.

Definition

Pedigree charts

Pedigree charts are family tree diagrams that track the inheritance of traits across generations.

Standard Symbols Make Every Pedigree Readable

Tip

Squares are males, circles are females, and shaded shapes are affected individuals.
Start by finding the affected individuals and their relationships to work out the pattern.

Reading the Pattern of Inheritance

Autosomal Recessive Traits

Characteristics
1. The trait can skip generations.
2. Two unaffected parents can have an affected child.
3. Males and females are affected equally often.
Genotypes
1. Affected individuals are $aa$ (homozygous recessive).

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Tip

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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.
Duis aute irure dolor in reprehenderit in voluptate velit esse cillum.

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Pedigree Charts Reveal How a Trait Is Inherited

Pedigree charts map a trait through a family to show whether it is dominant or recessive, and autosomal or sex-linked.
They are especially useful for human genetic disorders, where controlled breeding experiments are not possible.

Definition

Pedigree charts

Pedigree charts are family tree diagrams that track the inheritance of traits across generations.

Standard Symbols Make Every Pedigree Readable

Tip

Squares are males, circles are females, and shaded shapes are affected individuals.
Start by finding the affected individuals and their relationships to work out the pattern.

Reading the Pattern of Inheritance

Autosomal Recessive Traits

Characteristics
1. The trait can skip generations.
2. Two unaffected parents can have an affected child.
3. Males and females are affected equally often.
Genotypes
1. Affected individuals are $aa$ (homozygous recessive).

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 D3.2.13: Pedigree Charts to Deduce Patterns of Inheritance of Genetic Disorders Notes

A - Unity and Diversity9 subtopics

B - Form and Function10 subtopics

C - Interaction and Interdependence9 subtopics

D - Continuity and Change12 subtopics

Pedigree Charts Reveal How a Trait Is Inherited

Standard Symbols Make Every Pedigree Readable

Reading the Pattern of Inheritance

Autosomal Recessive Traits

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

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Pedigree Charts Reveal How a Trait Is Inherited

Standard Symbols Make Every Pedigree Readable

Reading the Pattern of Inheritance

Autosomal Recessive Traits

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