Consider the following genetically controlled biosyntheticpathway for pigments in the flowers of a hypothetical plant:
White ââ â white ââ â pink ââ â red
Assume that the gene A encodes and enzyme that converts thefirst white pigment into the second white pigment. The dominantallele of A encodes a functional enzyme while the recessive alleleencodes an enzyme with zero activity.
Assume that the gene B encodes and enzyme that converts thesecond white pigment into the pink pigment. The dominant allele ofB encodes a functional enzyme while the recessive allele encodes anenzyme with zero activity.
Assume that the gene C encodes and enzyme that converts the pinkpigment into the red pigment. The dominant allele of C encodes afunctional enzyme while the recessive allele encodes an enzyme withzero activity.
Assume that the gene D encodes a protein that regulates theexpression of gene C. The dominant allele of D encodes a proteinthat inhibits the expression of the C gene while the recessiveallele encodes a protein that allows the expression of gene C.
Assume that flower color is determined solely by these fourgenes and that they assort independently.
What would be the proportions of red, pink and white flowers inthe offspring of a cross between two plants each with the genotypeAaBbCcDd?
Consider the following genetically controlled biosyntheticpathway for pigments in the flowers of a hypothetical plant:
White ââ â white ââ â pink ââ â red
Assume that the gene A encodes and enzyme that converts thefirst white pigment into the second white pigment. The dominantallele of A encodes a functional enzyme while the recessive alleleencodes an enzyme with zero activity.
Assume that the gene B encodes and enzyme that converts thesecond white pigment into the pink pigment. The dominant allele ofB encodes a functional enzyme while the recessive allele encodes anenzyme with zero activity.
Assume that the gene C encodes and enzyme that converts the pinkpigment into the red pigment. The dominant allele of C encodes afunctional enzyme while the recessive allele encodes an enzyme withzero activity.
Assume that the gene D encodes a protein that regulates theexpression of gene C. The dominant allele of D encodes a proteinthat inhibits the expression of the C gene while the recessiveallele encodes a protein that allows the expression of gene C.
Assume that flower color is determined solely by these fourgenes and that they assort independently.
What would be the proportions of red, pink and white flowers inthe offspring of a cross between two plants each with the genotypeAaBbCcDd?
