Topic 9

Question 1

allelic polymorphism

Answer 1

a gene with more than one allele occupies that genes locus within a population, must occut at least in 1% in the popultion
- incr combos in a population ex albino locus, mora than one phenotype in a popualtion

Question 2

epistasis

Answer 2

one gene depends on another to be expressed
- BBcc = cc, not expressed
- BBcC = cC, expressed
(Black/brown, cc albino = no pigment expressed if cc

Question 3

pleidotrophy

Answer 3

one gene responsible for many unrelated phenotype effects, can be dysfunctional or lethal in many breeds

• aka side effect of genes
• the product is used in many cells/rections

Question 4

superdominance

Answer 4

Aa more fit than AA or aa
heterozygote > homozygote
- maintain polymorphism
- explain genetic variability

Question 5

X - linked inheritance

Answer 5

F = XX, M = XY (birdF = ZW, birdM =ZZ)

• recessive x - linked alleles expressed in heterogametic sex, males, female birds
• ex hemophilia, mother is carrier, 50% of offspring affected