genetics model 2012 fieldspart 4
DESCRIPTION
TRANSCRIPT
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• Complete Dominance• Codominance• Incomplete Dominance• Sex-Linked
X-linked: gene lies on X chromosome (males only have one copy of the gene)
Y-linked: gene lies on Y chromosome (only males have the gene)
Contributes to younger mortality rate in males
• Polygenic Traits
Phenotypic Expression Varies
Hemophilia
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• Complete Dominance• Codominance• Incomplete Dominance• Sex-Linked
X-linked: gene lies on X chromosome (males only have one copy of the gene)
Y-linked: gene lies on Y chromosome (only males have the gene)
Contributes to younger mortality rate in males
• Polygenic Traits
Phenotypic Expression Varies
Hemophilia
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• Complete Dominance• Codominance• Incomplete Dominance• Sex-Linked
X-inactivation disables one x-chromosome in each cell (females and males each only use one x-chromosome)
can lead to unique phenotypes in females
• Polygenic Traits
Phenotypic Expression Varies
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Practice
• Sex-linked practice “Pipe Cleaner babies and genetic traits”. Complete and glue to page ___ of your notebook
• OR, do sex linked handout
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Calico is a coat color found in cats, which is caused by a SEX-LINKED, CODOMINANT allele. B = black, R = orange, and BR = calico.The following genotypes are possible; Female cats can be black XBXB, orange XRXR, or calico XBXR
Male cats can be black XBY or orange XRY
X Linked Genetics in the Calico Cat
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• Complete Dominance• Codominance• Incomplete Dominance• Sex-Linked• Polygenic Traits
Controlled by more than one gene
Most common type ofexpression
Phenotypic Expression Varies
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Pedigree Rules
• What is a pedigree?
• *A pedigree is a chart that shows all
family members and how they are related. It follows certain rules and shows genotypes and phenotypes.
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– Boys Shaded- Phenotype being “traced”
– Girls X deceased
Marriage same level=same generation
Mating w/o marriage Carrier (heterozygous)
Kids Adopted
Twins
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• Draw a pedigree for your immediate family (mom, dad, step parents, siblings, etc)
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Trait
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Trait
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Trait
traits
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Trait
traits
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Trait
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Trait
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Pedigrees
• Graphically shows the lineage of a disorder in a particular family
• Be able to tell if disorder is dominant, recessive, or sex-linked from a pedigree
• Be able to predict the chance that an indicated couple will have a child with the disorder
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Pedigrees
Where would a gene be if it was autosomal?
Where would it be if it was sex-linked?
What gender is this person?
• Autosomal: Not sex-linked
Human Chromosomes
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Pedigrees
Autosomal DominantHow can we tell?
• Autosomal: Not sex-linked
Human Chromosomes
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Pedigrees
Autosomal RecessiveHow can we tell?
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Pedigrees
Sex-LinkedHow can we tell?
Is the X-linked dominant or recessive?
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Pedigree Analysis Case Study• Read family information• Put family name at the top of your whiteboard• Make a pedigree for the entire family• Label names of all family members that you know• Make a key for the possible genotypes and phenotypes of your trait. Label as many
individual genotypes on the pedigree that you can.• Shade in the people that have the trait • Identify the Patterns in the Pedigree and write the following answers on your
whiteboard:– Is the trait dominant or recessive?– Does the trait show up in every generation? Or, does the trait skip a generation?– Does the trait affect males/females equally? Or, Does the trait only affect males?
Or, only females?– Does your trait fit our model? (why or why not?) If not, what rule(s) need to
change, or what new rules do you need to explain how this trait is inherited?• YOUR PATTERN SHOULD SUPPORT YOUR ANSWER.• • Get your teacher’s approval to chart all of this on paper.