Genetics 2 Flashcards

1
Q

What is a pedigree?

A

It is a diagram of a family tree, of affected and unaffected individuals.

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2
Q

What is the testcross used for?

A

It is to determine the unknown genotype of the person with a dominant phenotype. Basically you have to find out whether the individual is homozygous dominant or heterozygous for the trait.

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3
Q

Tips for autosomal recessive pedigrees:

A
  • homozygous recessive individual are affected
  • heterozygous are carriers
  • homozygous dominant is not affected
  • normal parents can have affected offspring
  • the condition can often appear suddenly or skip a generation
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4
Q

Tips for autosomal dominant pedigree:

A
  • homozygous recessive individuals are not affected
  • homozygous dominant and heterozygous is affected
  • affected offspring have at least one affected parent
  • the condition does not skip a generation
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