*The normal color of snapdragons is red. Some pure lines showing variation in flower color have been found. Analyze the following crosses and do the following:2
Explain the inheritance of these colors (include number of genes, alleles and dominance relationships).
Determine the genotypes of the parents and the F1 of each cross.
Propose a biochemical pathway for flower color production in snapdragons.
Parents F1 F2
1. orange x yellow orange 3 orange: 1 yellow
2. red x orange red 3 red: 1 orange
3. red x yellow red 3 red: 1 yellow
4. red x white red 3 red: 1 white
5. yellow x white red 9 red: 3 yellow: 4 white
6. orange x white red 9 red: 3 orange: 4 white
7. red x white red 9 red: 3 yellow: 4 white
*The normal color of snapdragons is red. Some pure lines showing variation in flower color have been found. Analyze the following crosses and do the following:2
Explain the inheritance of these colors (include number of genes, alleles and dominance relationships).
Determine the genotypes of the parents and the F1 of each cross.
Propose a biochemical pathway for flower color production in snapdragons.
Parents F1 F2
1. orange x yellow orange 3 orange: 1 yellow
2. red x orange red 3 red: 1 orange
3. red x yellow red 3 red: 1 yellow
4. red x white red 3 red: 1 white
5. yellow x white red 9 red: 3 yellow: 4 white
6. orange x white red 9 red: 3 orange: 4 white
7. red x white red 9 red: 3 yellow: 4 white
Related textbook solutions
Related questions
While working with a purple flower, you identify a set of mutant flowers that are blue and another set of mutants that are red. You hypothesize that the genes that regulate flower color act together in the biosynthetic pathway displayed below:
Blue pigment --> red pigment --> purple pigment
To test your hypothesis, you cross two heterozygous purple flowers together and observe the offspring. If your hypothesis is correct, which of the following phenotypic ratios do you expect to observe?
| a. | 9 purple: 3 blue: 3: red: 1 white | |
| b. | 9 purple: 3 blue: 4 red | |
| c. | 9 purple: 4 blue: 3 red | |
| d. | 12 purple: 3 blue: 1 red | |
| e. | 12 purple: 1 blue: 3 red | |
| f. | 9 purple: 7 white |
