LB 145 Exam 3
, Autosomal Dominant Inheritance - VERIFIED ANSWERS-Males and
females are equally likely to be affected
-Affected offspring MUST have at least one affected parent
-Trait does not skip generations
-Affected offspring inherit at least 1 non-functional allele from parents
(so at least 1 parent must be affected)
Sex linked inheritance-X linked recessive - VERIFIED ANSWERS-
Males are affected more frequently than females
-Trait is never passed from father to son
-Trait often skips generations
-Males need only on Xd to be affected, females need two Xd, which is
why males are more frequently affected
-Unaffected heterozygous females can pass recessive allele to affected
sons
multiple allelism - VERIFIED ANSWERSmore than 2 alleles in the
population, more than 2 phenotypes in the population
eg; blood type
codominance - VERIFIED ANSWERSphenotypes of BOTH ALLELS
displayed
Ia and Ib are codominant, i is recessive
Incomplete dominance - VERIFIED ANSWERSheterozygotes have
intermediate phenotype
Pleiotropy - VERIFIED ANSWERSone gene determines many traits
eg; pleiotropic consequence of the HbS mutation in beta globin gene
Polygenic Inheritance - VERIFIED ANSWERSmany genes control one
trait, small, additive effect of each allele
-polygenic quantitative traits are usually continuous (not discrete or
count date)
eg; skin color
, Autosomal Dominant Inheritance - VERIFIED ANSWERS-Males and
females are equally likely to be affected
-Affected offspring MUST have at least one affected parent
-Trait does not skip generations
-Affected offspring inherit at least 1 non-functional allele from parents
(so at least 1 parent must be affected)
Sex linked inheritance-X linked recessive - VERIFIED ANSWERS-
Males are affected more frequently than females
-Trait is never passed from father to son
-Trait often skips generations
-Males need only on Xd to be affected, females need two Xd, which is
why males are more frequently affected
-Unaffected heterozygous females can pass recessive allele to affected
sons
multiple allelism - VERIFIED ANSWERSmore than 2 alleles in the
population, more than 2 phenotypes in the population
eg; blood type
codominance - VERIFIED ANSWERSphenotypes of BOTH ALLELS
displayed
Ia and Ib are codominant, i is recessive
Incomplete dominance - VERIFIED ANSWERSheterozygotes have
intermediate phenotype
Pleiotropy - VERIFIED ANSWERSone gene determines many traits
eg; pleiotropic consequence of the HbS mutation in beta globin gene
Polygenic Inheritance - VERIFIED ANSWERSmany genes control one
trait, small, additive effect of each allele
-polygenic quantitative traits are usually continuous (not discrete or
count date)
eg; skin color
