Tallness (t) in snapdragons is dominant to dwarfness (t), and red (r) flower color is dominant to white (r). the heterozygous condition results in pink (rr) flower color. if snapdragons are heterozygous for height as well as for flower color, a mating between them will result in what ratio? a) 9: 4: 3b) 1: 2: 1c) 27: 9: 9: 9: 3: 3: 3: 1d) 9: 3: 3: 1e) 6: 3: 3: 2: 1: 1
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Ответ:
E. 6:3:3:2:1:1
Explanation:
Look at the attached picture to see the Punnett square for your problem.
The cross for this is snapdragons who are heterozygous for both traits so the cross would be:
TtRr x TtRr
As you can see in the image, you have the following genotype combinations with the corresponding phenotype combinations:
GENTOTYPE PHENOTYPE NUMBER
TTRR Tall - Red 1
TtRR Tall - Red 2
TTRr Tall - Pink 2
TtRr Tall - Pink 4
TTrr Tall - White 1
Ttrr Tall - White 2
ttRR Short - Red 1
ttRr Short - Pink 2
ttrr Short - White 1
The following phenotype combinations in summary would then be:
Tall - Pink: 6
Tall - Red: 3
Tall - White: 3
Short - Pink: 2
Short - White: 1
Short - Red: 1
So the ratio is 9:3:3:2:1:1
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