The following four crosses all apply to diploid organisms.Assume that all the parents are true breeding. You are given thephenotypes of the parental generation and the phenotypic ratio ofthe F2 generation. You must supply the following information:
1) genotypes of the parents
2) the phenotypic ratio expected for a testcross of theF1
Define your symbols. (8points)
a) P cross: Red x Brown F2Phenotype Ratios: 9 red-brown 3 red 3 brown 1 white
1a) Parental Genotypes:
2a) Phenotypic ratio expected for a testcross of the F1:
b) P cross: Red x Tall F2Phenotype Ratios: 1 red, tall 2 red, intermediate 2 pink, tall 4pink,intermediate 2 pink, short 1 white, tall 2 white, intermediate1 white short
1b) Parental Genotypes:
2b) Phenotypic ratio expected for a testcross of the F1:
c) P cross: albino 1 x albino 2F2 Phenotype Ratios: 9 wild type 7 albino
1c) Parental Genotypes:
2c) Phenotypic ratio expected for a testcross of the F1:
The following four crosses all apply to diploid organisms.Assume that all the parents are true breeding. You are given thephenotypes of the parental generation and the phenotypic ratio ofthe F2 generation. You must supply the following information:
1) genotypes of the parents
2) the phenotypic ratio expected for a testcross of theF1
Define your symbols. (8points)
a) P cross: Red x Brown F2Phenotype Ratios: 9 red-brown 3 red 3 brown 1 white
1a) Parental Genotypes:
2a) Phenotypic ratio expected for a testcross of the F1:
b) P cross: Red x Tall F2Phenotype Ratios: 1 red, tall 2 red, intermediate 2 pink, tall 4pink,intermediate 2 pink, short 1 white, tall 2 white, intermediate1 white short
1b) Parental Genotypes:
2b) Phenotypic ratio expected for a testcross of the F1:
c) P cross: albino 1 x albino 2F2 Phenotype Ratios: 9 wild type 7 albino
1c) Parental Genotypes:
2c) Phenotypic ratio expected for a testcross of the F1:
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Related questions
In rats, several independently assorting autosomal genes affectcoat color. Gene A controls the distribution of yellowpigment in hair, and gene B causes black pigmentation. Thetwo genes interact as follows: AâBâ (gray), Aâbb(yellow), aaBâ (black), and aabb (cream). Thesegenotypes are only expressed in the presence of the dominant alleleof a third gene, C; rats with genotype cc arealbino.
a. Deduce the genotype of each albino mice, to the extent that ispossible, in the following table. Explain your answers.
True-breeding parents | F1 | F2 offspring |
Gray x albino-1 | All gray | 3/4 gray : 1/4 albino |
Gray x albino-2 | All gray | 9/16 gray : 3/16 yellow : 4/16 albino |
Part a. |
| Genotype of albino-1 parent is ⦠Explanation: |
| Genotype of albino-2 parent is ⦠Explanation: |
b. Deduce the genotype and phenotype of each parent in the followingtable. Explain your answers.
Parents | Numbers of offspring |
Cross 1 | 135 gray, 83 albino, 47 yellow, 44 black, 16 cream |
Cross 2 | 103 albino, 74 black, 25 cream |
Part b. | Parental phenotypes | Parental genotypes |
Cross 1 | x | x |
Explanation: | ||
Part b. | Parental phenotypes | Parental genotypes |
Cross 2 | x | x |
Explanation: | ||
c. A gray-colored rat ismated with one that is yellow. The offspring include an albino ratand a cream-colored rat. Diagram this cross. Be sure to include thePunnett square and the phenotypic ratio in the offspring.
Part c. |
| Cross is ⦠x Explanation: |
Punnett Square
Fill the punnet sq | ||||
Thank you
