Term
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Definition
the person whom the pedigree was initiated for
they are indicated by an arrow |
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Term
| autosomal recessive traits |
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Definition
appears only when a person recieves 2 alleles for the trait
if trait is uncommon the most parrents are heterozygous and unaffect
ex: Tay-Sachs |
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Term
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Definition
| mating between closely related people |
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Term
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Definition
must inherit an allele from one parent
does not skip generations
ex: hypercholesterolemia |
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Term
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Definition
appear more in males - they need only one copy to express the trait
inherited from mother - so the mother is usually unaffected, tends to skip gener.
not passed father to son - the father must pass the Y chromosome to son to make XY
ex:hemophilia |
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Term
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Definition
affect females more
must have an affected parent
does not skip generations
men do not pass it on to sons (Y)
ex: hypophosphatemia |
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Term
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Definition
affect only males
if the father is affected his sons will be affected
ex: maleness |
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Term
| dizygotic twins vs. monozygotic twins |
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Definition
di - 2 eggs, fertilized by 2 sperms
mono - 1 egg, fertilized by 1 sperm
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