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Biol 121- 2010.02.12- Genetics- Inheritance in Humans (Ch. 13, 19, 15).docx

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University of British Columbia
BIOL 121
Carol Pollock

Biol 121 225 Freeman 286289 401405 316318Feb 12 10 Pedigree to understand transmission of human traits must analyze human crosses that already exist bc making specific crosses will take too long and ethical issuesa pedigree like a family tree records genetic relationships among the individuals in a family along with each persons sex and phenotype with respect to the trait in question pedigree may reveal whether trait is due to dominant or recessive allele and whether it is on a sex chromosome or autosome Autosomal recessive traits if a phenotype is due to an autosomal recessive allele then1 Individuals with the trait must be homozygous recessive2 If parents of affected individual do not have the trait they are both heterozygous Carrier a carrier is a heterozygous individual who carries a recessive allele for an inherited diseasethey transmit the allele even though they do not exhibit signs of the disease 3 When carriers mate they produce offspring with the recessive phenotype 25 of the time Autosomal dominant trait individuals with at least one allele for the trait must have the phenotype unless new mutation occurs any child with the trait must have a parent with the trait eg Huntingtons disease Marker a marker is a trait that appears in people that have a specific disease eg in Huntingtons disease people have many CAG repeats on chromosome 4 which is unstable for the proteinresearchers found many CAG repeats in people with the disease and also found that affected individuals always have this traitthis means that this is the gene for the disease which they named IT15
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