Question

In the tomato, three genes are linked on the same chromosome. Tall is dominant to dwarf, fruit skin that is smooth is dominant to skin that is peachy, and fruit with a normal tomato shape is dominant to oblate shape. A plant that is true-breeding for dominant traits was crossed to a dwarf plant with peachy, oblate fruit. The F1 plants were then test crossed to dwarf plants with peachy, oblate fruit. The following results are obtained. 200 tall, smooth, normal 33 tall, smooth, oblate 11 tall, peach, oblate 2 tall, peach, normal 210 dwarf, peach, oblate 29 dwarf, peach, normal 12 dwarf, smooth, normal O dwarf, smooth, oblate What is the map distance between tall (dwarf) gene and smooth (peach) gene? (2pt) What is the map distance between smooth (peach) gene and normal (oblate) gene? (2pt) What is the map distance between tall (dwarf) gene and normal (oblate) gene? (2pt) Which phenotypes were resulted from double crossover? (2pt) Construct a map to show the linear order of the three genes (2pt) What is the value crossover interferenee (021247

Answer 1

'&= 33 200+33 +11+2+ 210 +29+120 X100% 497 Recombination frequency (RF) - Recombinants X100% I Pastor plant with tall Total offspring Si the recombination frequency (RF) 2004 3 11+2+ 210+29+12 and smooth gine, the recombina € 33X100%-6.6% since 1% RF is equivalent to map inete unit of distance 2. Distance between tall and smooth gene = 16.6 map unit cm) between a genes) 67 For plant with dwarf and smooth peach gene 29 x 100% 25.8% - Distance between dwarf and peach gene = [5.8 map winit /cm) BARF of plant with smooth and normal gene = 200+12% 100% 497 i Distance between smooth 42.6% 426 map oxitom .. Distance belween smooth and normal gene] 42.6 map unit /em HJ RF of plant with peach and oblate gene - 11+210 x100% - 497 :- Distance between peach and obtálegene = Felis map unit/cm) och and able = 44.5% 3. 2) RF of plant with tall and normal gene= 200+ 2 x 100% - 40.6% . Distance between tall and normal gene - 40.6 map unit Iem b] R. f of plant with dwarf and oblate gene= 210 to x 100% -42.8% - Distäne between dwarf and oblate gene - Kez. 37 mapunit ICM (1 Double cross between the parental plants resulted in the generation of a phenotypes at s n Dwarf plant with smooth fruit skin and normat with oblate shape of tomato 6 I ol & Tall plant with peachy fruit skin with tomato Smooth gene. Hormal gene I tall gene Observed ned double to take © Crossover interference Lerpected ho-double recombinantys CamScanner 1:39=1-744 -0.447 427 shape of recombinanta FI 1 - Scanned wit! 2-peited