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Drill #2 2/24/10. From last night’s reading you learned that traits in families can be tracked through the generations. Please describe why you think this is an important practice. Pedigrees?. Or. A Little Bit of Vocab…. Pedigree :

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drill 2 2 24 10
Drill #22/24/10
  • From last night’s reading you learned that traits in families can be tracked through the generations. Please describe why you think this is an important practice.
a little bit of vocab
A Little Bit of Vocab….
  • Pedigree:

A tool used to determine how one particular trait is inherited

  • Wild-Type:

Phenotype that appears most often in the population

trait inheritance
Trait Inheritance
  • Traits can be inherited on either Autosomes or Sex Chromosomes

Which Sex Chromosome do you think has more genetic disorders found on it?

autosomal inheritance
Autosomal Inheritance
  • Autosomal Recessive:
    • Caused by presence of two recessive alleles (dd)
    • There are “Carriers” – (Dd)
      • Do not have the trait, but contain a copy of the allele
    • Usually does not show up in all generations (skips)

Cystic Fibrosis

Albinism

autosomal inheritance1
Autosomal Inheritance
  • Autosomal Dominant:
    • Any copy of a dominant allele will result in the disorder (DD or Dd)
    • There are no carriers – Why?
      • A person with Dd has the disorder!

Achondroplasia

Webbed-Toes

Polydactyly

slide10

Why are most lethal Dominant alleles uncommon?

Usually, autosomal traits show up in 50% males/50% females, why?

sex linked
Sex Linked
  • X-Linked Recessive:
    • Must have only recessive copies of the allele
    • Female = XdXd – Must have both copies
    • Male = XdY– Only needs one copy

Fruit Flies – White Eyes

Color-Blindness

Hemophilia

slide12

Female “Carriers”

Males have trait

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