lecture 19

Question 1

What is the product rule

Answer 1

independent events - events happen separately, probability of one does not affect the other
e.g SsYy x SsYy = ssyy (1/16)

Question 2

What is the sum rule

Answer 2

mutually exclusive events (a or b) one or other can happen

Question 3

what does polymorphic mean

Answer 3

2 or more phenotypes - alleles

individuals can only have 2 alleles - one each homologous chromosome

Question 4

What is incomplete dominance

Answer 4

if F1 has an intermediate phenotype

suggests blending

Question 5

How can blending be differentiated from blending

Answer 5

if F2 shows the p phenotype then it is particulate inheritance - which maintains variation

Question 6

What is Co-dominance

Answer 6

both parental phenotypes are present in f1

e.g blood

Question 7

what are Polygenic traits

Answer 7

Phenotype controlled by many genes that have an additive effect
continuous or quantitative e.g skin colour, weight, height

Question 8

What is the typical distribution of a polygenic trait

Answer 8

typically normal distribution

Question 9

What also effects phenotype

Answer 9

environment e.g nutrition, height/weight