Classical Genetics

Question 1

Classical genetics can only be done with ______

Answer 1

Model organisms

Question 2

Test cross

Answer 2

Cross cell/organism with dominant phenotype but unknown genotype to a homozygous recessive tester

Question 3

If results of a reciprocal cross are not the same ?

_________

Answer 3

The genes are on a sex chromosome

Question 4

Dihybrid selfcross/intercross

Answer 4

Cross two dihybrids

Get 9:3:3:1 ratio

Question 5

If dihybrid self cross not 9:3:3:1 then?

Answer 5

Gene interaction occurs

Question 6

Dihybrid testcross

Answer 6

Cross dihybrid with a homozygous recessive

Question 7

If dihybrid cross not 1:1:1:1 then?

Answer 7

The genes are on the same chromosome

Question 8

Multiplication rule

Answer 8

Probability that two events both occur

= probability that one occurs X probability that the second occurs

Question 9

Addition Rules

Answer 9

Probability that either event will occur

= probability that one will occur + probability the second will occur

Question 10

Subtraction rule

Answer 10

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