Chapter 6: Pedigree Analysis Flashcards
Why are humans bad model organisims?
-controlled mating is not possible
-long generation time
-small family size
Pedigree
a pictorial representation of a family history, a family tee that outlines the inheritance of one or more characteristics
Are pedigrees typically dihybrid or single?
single
Proband
the person from whom the pedigree is initiated
What do pedigrees indicate?
first instance of a trait/disease
What should you look for in pedigrees?
-gender
-generationship
-Who recieves the trait?
What type of traits usually appear equally in males and females and tend to skip generations?
autosomal recessive traits
What is more likely to appear among progeny of related parents?
autosomal recessive traits
What trait usually appears equally in males and females?
autosomal dominant
Why are autosomal dominant triats equal in males and females?
because we both share autosomes
Do autosomal dominant traits skip generations?
yes
How are traits passed in autosomal dominant traits?
unaffected persons do not transmit the trait and affected persons have at least one affected parent
In what does an affected male not pass the trait to his sons but can pass the allele to a daughter?
X-Linked Recessive
Why is daughter passed the trait in X-linked recessive, but they are unaffected?
Due to XX (this is why they are unaffected)
Does an X-Linked Recessive daughter who has a trait, pass the trait to her sons? If so, are they affected?
Yes because they only have one X
