lecture 8

Question 1

describe incomplete dominance

Answer 1

• blend of phenotypes
• expect a 1:2:1 ratio

Question 2

describe co-dominance

Answer 2

• situation which heterzygote shows the phenotypic effects of both allels equally
• ex. blood

Question 3

Use sickle cell amenia to decribe recessive lethal alleles

Answer 3

• hetero show resistance to malarial infection
• evoultion selected for het phenotype of moderate disease
• incomplete dominacne at phenotypic lvl
• co-dominant at blood lvl

Question 4

describe allelic series

Answer 4

• multiple alleles of the same gene
• set of mutations will have different dominance relationship within the series
• ex. fly eye colour
• each allelic relationship must be determined by a heterzygote