Chapter 5 book

Question 1

Syntenic genes

Answer 1

genes on same chromosome

Question 2

Gene linkage

Answer 2

2 syntenic gens don’t assort independently

Question 3

Homologous recombinants

Answer 3

process that occurs when crossing over in prophase I

Question 4

recombinant chromosomes

Answer 4

nonparental chromosomes from reshuffling of alleles

Question 5

Parental chromosomes

Answer 5

Homologous chromosomes that don’t crossover retain the same alleles as parents

Question 6

What happens if the syntenic genes are closer together

Answer 6

They will recombine less than farther genes

Question 7

What are linked genes also

Answer 7

syntenic genes

Question 8

If genes are linked what is the likely outcome of the gametes

Answer 8

more gametes with parental chromosomes

Question 9

genetic linked mapping

Answer 9

plots points of genes on chromosomes

Question 10

If there is gene linkage explain the percentage of offspring

Answer 10

Parentals will by 50% or greater than recombinants

Question 11

Recombination frequency formula

Answer 11

of recombinants/ total # of offspring

Question 12

What did William Bateson and Reginald Punnett study

Answer 12

flower color and shape of pollen in sweet peas

Question 13

PPLL purple and long crossed with ppll red and short and produced PpLl purple and long. F1 was then self crossed and produced P_L_ 4831, P_ll 390, ppL_ 393, and ppll 1338. What does this show

Answer 13

The 2 parental alleles stayed together frequently

Question 14

Who created the first gene linkage map?

Answer 14

Morgan

Question 15

2 point test cross analysis

Answer 15

F1 crossed with recessive where 2 genes are test

Question 16

What is the distance of vg and pr
when vg+pr+/vgpr has a 2 point test cross analysis to produce
vg+pr+/vgpr= 1339
vgpr/vgpr=1195
vg+pr/vgpr=154
vgpr+/vgpr=151

Answer 16

305/2839=.1
10 centimorgan

Question 17

centiMorgan

Answer 17

units of physical distance by recombination frequency

Question 18

double crossover

Answer 18

2 genes switch simultaneously and least frequent

Question 19

interference

Answer 19

reduction of number of double crossovers relative to number of expected caused by

Question 20

interference formula

Answer 20

1- coco

Question 21

coefficient of coincidence formula

Answer 21

Observed double/ expected double

Question 22

how do you find the expected double

Answer 22

total(a-b distance)(b-c distance

Question 23

explain how you find gamete frequencies from genetic maps

Answer 23

distance is recombo so divide by 1/2 to get each half. parentals subtract 100- distance then divide by 1/2

Question 24

mapping function

Answer 24

correlates map distance and recombo frequency