Question

Assume the following is a biochemical pathway involved in producing flower color pigments in the flowering plant Rhododendron. Colorless Precursor --Enzyme R--> Red Flower Pigment --Enzyme O--> Orange Flower Pigment Enzyme R is encoded by gene R, which has two alleles: the r+ allele is a wild type allele and encodes functional enzyme R; the r- allele of gene R is a null, loss-of-function allele. Similarly, enzyme O is encoded by gene O, which has two alleles: the o+ allele is a wild type allele and encodes functional enzyme O; the o- allele of gene O is a null loss-of-function allele. Assume that if no red or orange pigment is produced the flowers are white in color. Answer all the following: A. What is the flower color phenotype of plants that are homozygous for r- and homozygous for o+? (2 points) B. What is the flower color phenotype of plants that are homozygous for r- and homozygous for o-? (2 points) C. What is the flower color phenotype of plants that are homozygous for r+ and homozygous for o-? (2 points) D. Describe the relationship between the alleles of genes R and O and explain your reasoning for your answer. (3 points)

          Assume the following is a biochemical pathway involved in producing flower color pigments in the flowering plant Rhododendron.

Colorless Precursor --Enzyme R--> Red Flower Pigment --Enzyme O--> Orange Flower Pigment

Enzyme R is encoded by gene R, which has two alleles: the r+ allele is a wild type allele and encodes functional enzyme R; the r- allele of gene R is a null, loss-of-function allele.
Similarly, enzyme O is encoded by gene O, which has two alleles: the o+ allele is a wild type allele and encodes functional enzyme O; the o- allele of gene O is a null loss-of-function allele.

Assume that if no red or orange pigment is produced the flowers are white in color.

Answer all the following:
A. What is the flower color phenotype of plants that are homozygous for r- and homozygous for o+? (2 points)
B. What is the flower color phenotype of plants that are homozygous for r- and homozygous for o-? (2 points)
C. What is the flower color phenotype of plants that are homozygous for r+ and homozygous for o-? (2 points)
D. Describe the relationship between the alleles of genes R and O and explain your reasoning for your answer. (3 points)

Assume the following is a biochemical pathway involved in producing flower color pigments in the flowering plant Rhododendron.

Colorless Precursor –Enzyme R–> Red Flower Pigment –Enzyme O–> Orange Flower Pigment

Enzyme R is encoded by gene R, which has two alleles: the r+ allele is a wild type allele and encodes functional enzyme R; the r- allele of gene R is a null, loss-of-function allele.
Similarly, enzyme O is encoded by gene O, which has two alleles: the o+ allele is a wild type allele and encodes functional enzyme O; the o- allele of gene O is a null loss-of-function allele.

Assume that if no red or orange pigment is produced the flowers are white in color.

Answer all the following:
A. What is the flower color phenotype of plants that are homozygous for r- and homozygous for o+? (2 points)
B. What is the flower color phenotype of plants that are homozygous for r- and homozygous for o-? (2 points)
C. What is the flower color phenotype of plants that are homozygous for r+ and homozygous for o-? (2 points)
D. Describe the relationship between the alleles of genes R and O and explain your reasoning for your answer. (3 points)

Added by Kelly M.

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