Lecture 11

Question 1

Multifactorial traits

Answer 1

discontinuous distribution of phenotypes
(eg. distinct blood groups A, B, AB, O) have genetic (many genes) and environmental factors.
Model of inheritance - threshold model

Question 2

Quantitative traits

Answer 2

• continuous distribution of phenotypes
• controlled by many genes
• each locus has two alleles
• one adds to trait and one does not
• no dominant phenotype
• affected by environmental factors

Question 3

More genes affecting a phenotype =

Answer 3

increase in differences between phenotypic classes is less distinct