chapter 5 part 1

Question 1

syntenic genes

Answer 1

genes located on the same chromosome

Question 2

linked genes

Answer 2

genes close enough on the same chromosome so they assort together more often than independently

Question 3

on more closely linked genes, is there more or less crossing over

Answer 3

less

Question 4

what units are used to express the distance between genes

Answer 4

map units

Question 5

max value for recombination frequency

Answer 5

50%

Question 6

why is genetic linkage quantified

Answer 6

to map the positions of the genes on chromosomes

Question 7

homologs that reshuffle produce

Answer 7

recombinant chromosomes

Question 8

homologs that don’t reshuffle produce

Answer 8

parental/nonrecombinant chromosomes

Question 9

genetic linkage mapping

Answer 9

plots positions of genes on chromosomes

Question 10

complete genetic linkage

Answer 10

observed when no crossing over occurs between linked genes

Question 11

is incomplete or complete linkage more common?

Answer 11

incomplete

Question 12

are parental and recombinant types equal?

Answer 12

no

Question 13

does crossing over occur more between genes that are farther apart or closer together

Answer 13

farther part

Question 14

genetic linkage is a _________ relationship among genes located near one another on a chromosome

Answer 14

physical

Question 15

what is recombination between genes accompanied by

Answer 15

physical exchange between the homologs - chromosome breakage and rejoining in plants and animals

Question 16

who showed that crossover is accompanied with breakage and rejoining

Answer 16

Creighton and McClintock

Question 17

who first demonstrated that genes are on chromosomes

Answer 17

Morgan

Question 18

who was Morgan’s student

Answer 18

Alfred Sturtevant

Question 19

what did Alfred Sturtevant use the results of several experiments to create

Answer 19

genetic map for 5 X-linked genes in Drosophila

Question 20

what is a map unit also called

Answer 20

centiMorgan (cM)

Question 21

recombination hotspots

Answer 21

where recombination and crossing over occurs at much higher rate

Question 22

hotspots and cold spots may lead to what

Answer 22

placement of genes farther apart or closer together on recombination map than on physical map

Question 23

what may hotspots and cold spots be due to

Answer 23

feasibility of DNA in those regions to initiate crossing over

Question 24

recent studies indicate that recombination occurs primarily where?

Answer 24

at specific hotspots

Question 25

ex. of organism with complete linkage

Answer 25

Drosophila

Question 26

what test is used to detect genetic linkage?

Answer 26

two-point test-cross analysis