lecture 18

Question 1

what does recombination occur between?

Answer 1

heterozygous homozygous chromosomes

Question 2

what are the genotypes involved in a test cross?

Answer 2

F1 generation crossed with a homozygous mutant

Question 3

how do you identify the parental genotypes in 3 point mapping?

Answer 3

they are the two with the highest frequencies of the F2 generation

Question 4

how do you find the expected percent of double recombinants?

Answer 4

multiply the RF between a-b by RF between b-c

Question 5

how do you find the expected number of double recombinants?

Answer 5

multiply the expected percent of double recombinants by total number of offspring

Question 6

what is the coefficient of confidence in regards to double recombination?

Answer 6

ratio of observed to expected double recombinants

Question 7

how do you find the C.o.C.?

Answer 7

take the number of actually occurring double recombinants in the offspring and divide by the calculated number of expected recombinants

Question 8

how do you find the interference in terms of double recombinants?

Answer 8

subtract C.o.C. from 1

Question 9

what is occurring when one crossover event encourages the other crossover event to occur?

Answer 9

positive interference

Question 10

is the interference coefficient positive or negative in positive interference?