click below
click below
Normal Size Small Size show me how
B2 Gene 12/1
B2 Gene 12/1 Lec 6 Polygenic and Multifactorial Inheritance
Question | Answer |
---|---|
What is polygenic inheritance? | non-Mendelian inheritance in which the phenotype is dependent on the additive effect of several genes at different loci. inheritance mode for most phenotypic traits allows for a great degree of variation within a population ex. skin color |
What are some characteristics which show a continuous normal distribution? | Blood pressure Dermatoglyphics (ridge count) Head circumference Height Intelligence Skin color |
are polygenic loci always additive? | No environmental factors can also affect phenotype (nutrition y height). Also a few genes influencing a trait may be dominant/recessive rather than additive This results in “regression toward the mean” |
What is multifactorial inheritance? | non-Mendelian inheritance in which the phenotype is determined by multiple genes and environmental factors. This results in many developmental anomalies |