Chapter 5

Question 1

Linkage

Answer 1

genes with loci physically located on the same chromosome

Question 2

Crossing over

Answer 2

events leading to genetic recombination (chromosome breakage and exchange)

Question 3

Recombination

Answer 3

process resulting in a new allele combinations on a chromosome

Question 4

How to distinguish recombinant and non-recombinant phenotypes

Answer 4

original combinations = non recombinant (parents gentoypes)

new combinations = recombinant (new genotypes)

Question 5

Understand that percentage of recombinant phenotypes goes down the more closely genes are linked/located

Answer 5

genes farther apart are more likely to crossover than those close together

genetic distance is measured by recombination frequency (1% recombination = 1 map unit)

Question 6

Understand when you would use a 2 point testcross vs when you would use a 3 point testcross and why.

Answer 6

when you have 2 genes, you use a 2 point
2 points give you the recombination frequency of each gene pair

when you have 3 genes in one cross, you use a 3 point
3 points can detect double crossover events