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Exam (elaborations)

6. In Drosophila, bristles (B) are dominant to hairless bristles whil

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6. In Drosophila, bristles (B) are dominant to hairless bristles while gray body (G) is dominant to black body. Each locus is located on a separate autosome. Knowing that the Pilies are homozygous, work the following crosses through the Fa generation to determine the genotypic and phenotypic ratios for each generation. A. Pi Bristled, gray X hairless, black B. P1 Hairless, gray X Bristled, black C. P1 Bristled, gray X hairless, gray Solution 6. Ans- A. P1-------                Bristled gray                ×                             Hairless black Genotype----           BBGG                                                               bbgg Gametes----             BG                                                                    bg F1------                                                  BbGg                                                                 (Bristled gray) Cross-------                         BbGg                     ×                            BbGg Gametes----                                       BG          Bg           bG          bg F2-----                                                   BG                       Bg                             bG                        bg    BG                          BBGG                 BbGg                        BbGG                    BbGg                                 (Brist Gray)      (Brist. Gray)          (Brst. Gray)             (Brst. Gray) Bg                         BBGg                    BBgg                     BbGg                 Bbgg                                 (Brst. Gry)           (Brst black)         (B)            (Brst. Black)   bG                           BbGg                    BbGg                     bbGG                     bbGg                                 (Brst. Gry)           (Brist gry)            (Hairls. Gry)        (hairls. Gry) bg                     BbGg                     Bbgg                      bbGg                   bbgg                                 (Brst. Gry)           (Brst. Blck)          (hairls. Gry)         (hairls. Blck) Phenotypic ratio= 9:3:3:1 ( Brist Gray: Brst black :Hairls. Gry: hairls. Blck) Genotypic ratio= 1:2:1:2:4:2:1:2:1 BBGG=1                               BbGg=2                                                bbGG= 1 BbGg=2                                BbGg=4                                                bbGg= 2 BBgg=1                                 bbgg=2                                                  bbgg= 1 B. P1-------                Hairless gray                     ×              Brist. Black Genotype----     bbGG                                                  BBgg Gametes----                bG                                                        Bg F1------                                                   BbGg                                                            (Bristled gray) Cross-------                         BbGg                     ×                           BbGg Gametes----                                       BG          Bg           bG          bg F2-----                   BG                          Bg                             bG                        bg BG                          BBGG                 BbGg                        BbGG                    BbGg                                 (Brist Gray)      (Brist. Gray)          (Brst. Gray)        (Brst. Gray) Bg                       BBGg                    BBgg                     BbGg                    Bbgg                                 (Brst. Gry)           (Brst black)         (B)          (Brst. Black)   bG                        BbGg                    BbGg                     bbGG                     bbGg                                 (Brst. Gry)           (Brist gry)            (Hairls. Gry)        (hairls. Gry) bg                      BbGg                     Bbgg                      bbGg                        bbgg                                 (Brst. Gry)           (Brst. Blck)          (hairls. Gry)        (hairls. Blck) Phenotypic ratio= 9:3:3:1 ( Brist Gray: Brst black :Hairls. Gry: hairls. Blck) Genotypic ratio= 1:2:1:2:4:2:1:2:1 BBGG=1                               BbGg=2                                                bbGG= 1 BbGg=2                                BbGg=4                                                bbGg= 2 BBgg=1                                 bbgg=2                                   bbgg= 1 C. P1-------                Bristled gray                     ×                               Hairless gray Genotype----          BBGG                                                                       bbGG Gametes----             BG                                                                             bG F1------                                                   BbGG                                                              (Bristled gray) Cross-------                         BbGG                    ×                                     BbGG Gametes----                                       BG                          bG          F2-----                                                   BG                                     bG                           BG                          BBGG                                    BbGG                                                 (Brist. Gry)                          (Brst. Gry)                 bG                          BbGG                                    bbGG                                                          (Brist. Gry )                       (Hairls. Gry) Phenotypic ratio= 3:1 ( Brst. Gry: Hairls. Gray) Genotypic ratio= 1:2:1 BBGG=1BbGG=2 bbGG=1

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6. In Drosophila, bristles (B) are dominant to hairless bristles while gray body (G) is dominant
to black body. Each locus is located on a separate autosome. Knowing that the Pilies are
homozygous, work the following crosses through the Fa generation to determine the genotypic
and phenotypic ratios for each generation. A. Pi Bristled, gray X hairless, black B. P1 Hairless,
gray X Bristled, black C. P1 Bristled, gray X hairless, gray


Solution


6. Ans-
A.
P1------- Bristled gray × Hairless black
Genotype---- BBGG bbgg
Gametes---- BG bg
F1------ BbGg
(Bristled gray)
Cross------- BbGg × BbGg
Gametes---- BG Bg bG bg
F2-----
BG Bg bG bg
BG BBGG BbGg BbGG BbGg
(Brist Gray) (Brist. Gray) (Brst. Gray) (Brst. Gray)
Bg BBGg BBgg BbGg Bbgg
(Brst. Gry) (Brst black) (Brst.gray) (Brst. Black)
bG BbGg BbGg bbGG bbGg
(Brst. Gry) (Brist gry) (Hairls. Gry) (hairls. Gry)
bg BbGg Bbgg bbGg bbgg
(Brst. Gry) (Brst. Blck) (hairls. Gry) (hairls. Blck)
Phenotypic ratio= 9:3:3:1 ( Brist Gray: Brst black :Hairls. Gry: hairls. Blck)
Genotypic ratio= 1:2:1:2:4:2:1:2:1
BBGG=1 BbGg=2 bbGG= 1
BbGg=2 BbGg=4 bbGg= 2
BBgg=1 bbgg=2 bbgg= 1
B.
P1------- Hairless gray × Brist. Black
Genotype---- bbGG BBgg
Gametes---- bG Bg
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  • 6 drosophila
  • drosophila bristles
  • bristles b
  • b are
  • are dominant
  • dominant hairless
  • hairless bristles
  • bristles whil
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