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B2 Gene 12/1

B2 Gene 12/1 Lec 6 Polygenic and Multifactorial Inheritance

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
Created by: VCOM2013