Springboard

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Springboard
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Toolbox Genetic Disorders
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Normal Chromosomes
Trisomy 21 or Downs Syndrome- affected
individuals live short lives and have severe
developmental problems
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Having the wrong number of sex chromosomes often
leads to the inability to reproduce properly.
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Sex-linked disorders
Hemophelia- x-linked disorder where blood can
not clot properly, causing the person to bleed
much more than normal. Note the recessive x on
the mother. Because males get one x they are Much
more likely to have this trait.
Sex linked gene- an allele that is inherited with a sex chromosome.
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Recessive Disorders
lt Cystic Fibrosis, a condition where fluid clogs
the lungs intefering with breathing
Sickle Cellgt Blood cells take a sickle shape,
clogging the bloodstream leaving the person weak
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A pedigree is a chart used by geneticists to track the inheritance of a trait over several generations
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Pedigrees allow doctors to determine if a child would be at risk for developing a condition, or if future children could pick up that condition.
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I II III IV

1. Which members of this family have the trait?
2. Which generation did the trait skip?
3. Is this trait dominant or recessive?
4. Would generation 4s children be at risk
   inheriting the trait?