In sweet peas the synthesis of purple anthocyanin pigment in the petals is controlled by two genes, B and D. The pathway is: Enzyme B Enzyme D White Intermediate Blue Intermediate - Anthocyanin (purple) What color petals would you expect in a pure-breeding (homozygous) plant unable to catalyze the fırst reaction (white to blue)? [ Select ] What color petals would you expect in a pure-breeding plant unable to catalyze the second reaction (blue to purple)? [ Select ] If the plants in parts a and b are crossed, what color petals will the offspring have? Select ]

In sweet peas the synthesis of purple anthocyanin pigment in the petals is controlled by two genes, B and D. The pathway is: Enzyme B Enzyme D White Intermediate Blue Intermediate - Anthocyanin (purple) What color petals would you expect in a pure-breeding (homozygous) plant unable to catalyze the fırst reaction (white to blue)? [ Select ] What color petals would you expect in a pure-breeding plant unable to catalyze the second reaction (blue to purple)? [ Select ] If the plants in parts a and b are crossed, what color petals will the offspring have? Select ]

Biology: The Dynamic Science (MindTap Course List)

4th Edition

ISBN:9781305389892

Author:Peter J. Russell, Paul E. Hertz, Beverly McMillan

Publisher:Peter J. Russell, Paul E. Hertz, Beverly McMillan

Chapter15: From Dna To Protein

Section15.1: The Connection Between Dna, Rna, And Protein

Problem 1SB

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Assume that two pigments, red and bluc, mix to give the normal purple color of petunia petals. Separate biochemical pathways synthesize the two pigments, as shown in pathways I and Il in the accompanying diagram. "White" refers to compounds that are not pigments (total lack of pigment results in a white petal). Red pigment forms from a yellow intermediate that is normally at a concentration loo kow to color petals. Bluc mixed with yellow makes green. Assume that no mutations are lethal. Pathway I.. White Blue Pathway I White, Yellow Red Pathway II White, White, A third pathway, whose compoundk do not contribute pelal pigmentation, normally docs not allfect the bluc and red pathways. However, if one of its intermediates (white3) should build up in concentration, it can be converted into the ycllow intermediate of the red pathway. In the diagram, the letiers A through E represent enzymes. The enzymes' correspoonding genes, all of which are unlinked, may be symbolized by the same letters.…
In roses, the synthesis of red pigment is produced by two steps in a pathway. gene O magenta intermediate - gene P colorless intermediate- red pigment What would the phenotype be of a plant homozygous for a null mutation of gene P? What would the phenotype be of a plant homozygous for a null mutation of gene Q? What would the phenotype be of a plant homozygous for null mutations of genes P and Q? magenta red Match a genotype to each strain. colorless Strain P locus Q locus homozygous null mutation of gene P homozygous null mutation of gene Q homozygous null mutations of genes P and Q Answer Bank plp PIP What F2 ratio is expected from crossing a plant that is homozygous for a null mutation of gene P with a plant that is homozygous for a null mutation of gene Q? Assume independent assortment. 9 colorless : 4 magenta : 3 red 9 red : 4 colorless : 3 magenta O 9 red : 4 magenta : 3 colorless
Would you simply answer the question for me, i saw many answers for it but still not sure. The flower color of genetically identical hemp plants (clones) is purple when the flowers develop under cold environment (30 °C). Describe in detail a molecular mechanism that could explain how these two groups of genetically identical plants differ in their gene expressions to produce different flower colors?
How is the concept of norm of reaction related to the lack of yellow hydrangea flowers illustrated in Figure 11-21?
In our feeding experiment with vermilion/brown and cinnabar/brown mutant flies, we were supposed to use kynurenine or hydroxykynurenine to overcome the enzymatic block in the ommochrome pathway, caused by the vermilion or cinnabar mutations. Which eye color would you expect for each of the two double mutants, if we had supplemented the medium with N-formylkynurenine? Use a diagram of the pathway to explain your answer.
In paper chromatography of spinach leaves: (a) Which of the pigments moves faster and why? (b) Which of the pigments stands out?
C4 and CAM plants Label the following.
The herbicide glyphosate (Roundup®) kills plants by inhibiting an enzyme needed for the synthesis of phenylalanine. Deprived of phenylalanine, the plant cannot make the proteins it needs, and it gradually weakens and dies. Although a small amount of glyphosate is deadly to a plant, its human toxicity is quite low. a. Suggest why this powerful herbicide has little effect on humans. (b) Discuss the chemical properties of Glyphosate as an herbicide.
A number of auxotrophic mutant strains were isolated from wild-type haploid Neurospora crassa. These strains responded to the addition of certain nutritional supplements to minimal culture medium either by growth (+) or no growth (0) The data from this experiment are presented in the table below. Diagram a biochemical pathway, complete with positions of intermediates, that is consistent with the data. Indicate where in the pathway each mutant strain is blocked.
. In a certain plant, the flower petals are normally purple.Two recessive mutations arise in separate plants and arefound to be on different chromosomes. Mutation 1 (m1)gives blue petals when homozygous (m1/m1). Mutation2 (m2) gives red petals when homozygous (m2/m2).Biochemists working on the synthesis of flower pigments in this species have already described the following pathway:colorless (white)compoundblue pigmentred pigmentenzyme Aenzyme Ba. Which mutant would you expect to be deficient inenzyme A activity?b. A plant has the genotype M1/m1 ; M2/m2. Whatwould you expect its phenotype to be?c. If the plant in part b is selfed, what colors of progenywould you expect and in what proportions?d. Why are these mutants recessive?
You identify an auxotroph that doesn't grow in normal medium, but does grow in medium supplemented with Q, indicating that it has a defect in one or more enzymes in this pathway. This auxotroph is also able to grow if you supplement the medium with D. Does this data support the one gene-one enzyme hypothesis? a yes, because only one enzyme is disrupted by the mutation b yes, because only one enzyme in the pathway is functional in the mutant strain c no, because multiple enzymes in the pathway could be functional in the mutant strain d no, because multiple enzymes could be disrupted by the mutation
The substrate which was used to investigate the enzymatic activity of wheat bran phosphatase was p-nitrophenyl phosphate. It is converted to p-nitrophenol and inorganic phosphate by this enzyme. P-nitrophenol has a pKa of 7.1 and is colorless, while its conjugate base, p-nitrophenolate has a yellow color. The enzyme assay was performed at pH 5.1 after the 0.5 N KOH is added at the end of each enzyme assay, the pH of the assay mixture is raised to 9.1. Why was the base added?