In dogs, the B gene control the color of pigment that a dog makes. The dominant B allele leads to the production of black pigment and the recessive ballele leads to a brown colored pigment Another gene, the S gene, determines if the dog coat has spotting. The dominant S allele leads to a solid coat color and a recessive s allele leads to extreme white piebald spotting like in dalmations). A black male dog with white spotting was crossed to a solid black female dog. They were mated several times over a number of years and had the following F1 progeny: Phenotype of F1 Progeny # of Progeny Solid Black Black with white spotting Solid Brown 24 23 9 Brown with white spotting Total: 8 64 a. What are the most likely genotypes of the parents (P generation) with respect to the B and S genes? Genotype of black male dog with white spotting: Genotype of solid black female dog: b. If one of the solid brown F1 dogs were crossed to one of the black spotted dogs (heterozygous at the B locus), what genotypic ratio would you expect to see in the F2 progeny? Please give only the ratio without any extra characters like spaces or genotypes (e.g. 12:3:1) c. If one of the solid brown F1 dogs were crossed to one of the black spotted dogs (heterozygous at the B locus), what phenotypic ratio would you expect to see in the F2 progeny? Please give only the ratio without any extra characters like spaces or descriptions of the phenotype (e.g. 12:3:1)
In dogs, the B gene control the color of pigment that a dog makes. The dominant B allele leads to the production of black pigment and the recessive ballele leads to a brown colored pigment Another gene, the S gene, determines if the dog coat has spotting. The dominant S allele leads to a solid coat color and a recessive s allele leads to extreme white piebald spotting like in dalmations). A black male dog with white spotting was crossed to a solid black female dog. They were mated several times over a number of years and had the following F1 progeny: Phenotype of F1 Progeny # of Progeny Solid Black Black with white spotting Solid Brown 24 23 9 Brown with white spotting Total: 8 64 a. What are the most likely genotypes of the parents (P generation) with respect to the B and S genes? Genotype of black male dog with white spotting: Genotype of solid black female dog: b. If one of the solid brown F1 dogs were crossed to one of the black spotted dogs (heterozygous at the B locus), what genotypic ratio would you expect to see in the F2 progeny? Please give only the ratio without any extra characters like spaces or genotypes (e.g. 12:3:1) c. If one of the solid brown F1 dogs were crossed to one of the black spotted dogs (heterozygous at the B locus), what phenotypic ratio would you expect to see in the F2 progeny? Please give only the ratio without any extra characters like spaces or descriptions of the phenotype (e.g. 12:3:1)
Human Biology (MindTap Course List)
11th Edition
ISBN:9781305112100
Author:Cecie Starr, Beverly McMillan
Publisher:Cecie Starr, Beverly McMillan
Chapter20: Chromosomes And Human Genetics
Section: Chapter Questions
Problem 7CT: The following pedigree shows the pattern of inheritance of red-green color blindness in a family....
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Transcribed Image Text:In dogs, the B gene control the color of pigment that a dog makes. The dominant B allele leads to the production of black pigment and the recessive ballele leads to a brown colored pigment
Another gene, the S gene, determines if the dog coat has spotting. The dominant S allele leads to a solid coat color and a recessive s allele leads to extreme white piebald spotting like in
dalmations). A black male dog with white spotting was crossed to a solid black female dog. They were mated several times over a number of years and had the following F1 progeny:
Phenotype of F1 Progeny # of Progeny
Solid Black
Black with white spotting
Solid Brown
24
23
9
Brown with white spotting
Total:
8
64
a. What are the most likely genotypes of the parents (P generation) with respect to the B and S genes?
Genotype of black male dog with white spotting:
Genotype of solid black female dog:
b. If one of the solid brown F1 dogs were crossed to one of the black spotted dogs (heterozygous at the B locus), what genotypic ratio would you expect to see in the F2 progeny? Please
give only the ratio without any extra characters like spaces or genotypes (e.g. 12:3:1)
c. If one of the solid brown F1 dogs were crossed to one of the black spotted dogs (heterozygous at the B locus), what phenotypic ratio would you expect to see in the F2 progeny? Please
give only the ratio without any extra characters like spaces or descriptions of the phenotype (e.g. 12:3:1)
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