1. Crossing of two punk panthers results in a ratio 9:4:3 ofpink, white and red panther cubs. Give a possible scheme of thecross, and genotypes of the parents and their offpsring.Explain
2. In dogs, white color is due to the pigment-inhibiting alleleI (this means that gentypes Ii and II produce white dogs but iidogs are colored). Color, in colored dogs (black or brown). Bothgenes are independently assorting. What is the ratio of phenotypesin the offspring of:
a) Two sibling brown dogs whose parents were white
b) two sibling dogs (one black and one brown) whose father wasbrown?
Show all three generations and schemes of crosses.
1. Crossing of two punk panthers results in a ratio 9:4:3 ofpink, white and red panther cubs. Give a possible scheme of thecross, and genotypes of the parents and their offpsring.Explain
2. In dogs, white color is due to the pigment-inhibiting alleleI (this means that gentypes Ii and II produce white dogs but iidogs are colored). Color, in colored dogs (black or brown). Bothgenes are independently assorting. What is the ratio of phenotypesin the offspring of:
a) Two sibling brown dogs whose parents were white
b) two sibling dogs (one black and one brown) whose father wasbrown?
Show all three generations and schemes of crosses.
Related textbook solutions
Related questions
In rats, several independently assorting autosomal genes affectcoat color. Gene A controls the distribution of yellow pigment inhair, and gene B causes black pigmentation. The two genes interactas follows: AâBâ (gray), Aâbb (yellow), aaBâ (black), and aabb(cream). These genotypes are only expressed in the presence of thedominant allele of a third gene, C; rats with genotype cc arealbino.
a. Deduce the genotype of each albino mice, to the extent thatis possible, 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 |
b. Deduce the genotype and phenotype of each parent in thefollowing table. 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 |
c. A gray-colored rat is mated with one that is yellow. Theoffspring include an albino rat and a cream-colored rat. Diagramthis cross. Be sure to include the Punnett square and thephenotypic ratio in the offspring.
