Classical Genetics Flashcards
Classical genetics can only be done with ______
Model organisms
Test cross
Cross cell/organism with dominant phenotype but unknown genotype to a homozygous recessive tester
If results of a reciprocal cross are not the same ?
_________
The genes are on a sex chromosome
Dihybrid selfcross/intercross
Cross two dihybrids
Get 9:3:3:1 ratio
If dihybrid self cross not 9:3:3:1 then?
Gene interaction occurs
Dihybrid testcross
Cross dihybrid with a homozygous recessive
If dihybrid cross not 1:1:1:1 then?
The genes are on the same chromosome
Multiplication rule
Probability that two events both occur
= probability that one occurs X probability that the second occurs
Addition Rules
Probability that either event will occur
= probability that one will occur + probability the second will occur
Subtraction rule
Either something will happen or it won’t
Probs event occurs + probs event doesn’t occur =1
1-probs event occurs= probs event doesn’t occur
1-probs event doesn’t occur =probs event occurs