Exam 4- linkage mapping

Question 1

using genetic information to determine the physical arrangement of genes on chromosomes

Answer 1

linkage mapping

Question 2

in a dihybrid test cross, the tester parent can only contribute ___ ___ for the genes being studied

thus, the phenotype(s) of the testcross progeny are determined by which allele(s) they receive from the ___ ___

Answer 2

recessive alleles; dihybrid parent

Question 3

map distance =

Answer 3

crossover events / total # of chromosomes x100

Question 4

the distance between two linked genes where 1% of the products of meiosis are recombinant

Answer 4

map unit

1 map unit = 1 centimorgan (cM)

Question 5

_________: the map distance is equal to the percentage of recombinant progeny

Answer 5

for two genes

Question 6

map distance is always less than ___ cM if the genes are ____

Answer 6

50; linked

Question 7

expected progeny phenotypes:

< 50% recombinant progeny

Answer 7

the genes exhibit linkage

Question 8

crossing over is a reciprocal exchange of alleles between____

Answer 8

non-sister chromatids