Please assist ASAP, a like is surely guaranteed! 1. In a plant species, flower-colour is determined by the biochemical pathway shown below:EAColourlessyelloworangeredpurpleGenes A, B, C, D, and E are independently assorting. The dominant alleles A, B, C and D encode enzymes that catalyse thecorresponding reactions indicated above. The recessive alleles a, b, c and d are non-functional and do not produce active enzymes. Thedominant E allele totally inhibits the action of gene C, while the recessive allele e has no effect.a)Determine the F1 and F2 phenotypes from a cross between AABBCCDDEE and AABBCCDDee plants.b)What proportion of the offspring of an AABBCCDDEE x AABBCCDDEE cross is expected to have coloured flowers?2. In a species of beetles, individuals may be red, black, white or tan. Colour is controlled by a single gene with multiple alleles in adominance series. Red (R) is dominant to black (Rb), black is dominant to white (RW) and white is dominant to tan (r) (R > Rb > RW >r).Colour variation in this species is a female sex-limited trait. Males carry the colour genes but are always phenotypically tan regardless oftheir genotype.What are the genotypes of the parents of the following cross?tan female x tan male produces 78 red females: 70 white females: 184 tan males

The accompanying Punnett Square shows the genotype of F1 age: AbD abD abd AabbDd aabbDd

Answered: ed above. The recessive al the action…

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Biology

ed above. The recessive al the action of gene C, whi

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

Chapter12: Mendel, Genes, And Inheritance

Section: Chapter Questions

Problem 9TYK: The ability of humans to taste the bitter chemical phenylthiocarbamide (PTC) is a genetic trait....

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1. In a plant species, flower-colour is determined by the biochemical pathway shown below: E A D Colourless blue yellow purple red Genes A, B, C, D, and E are independently assorting. The dominant alleles A, B, C and D encode enzymes that catalyse the corresponding reactions indicated above. The recessive alleles a, b, c and d are non-functional and do not produce active enzymes. The dominant E allele totally inhibits the action of gene C, while the recessive allele e has no effect. a) Determine the F1 and F2 phenotypes from a cross between AAbbCCDDEE and AABBCCDDee plants. b) What proportion of the offspring of an AaBBCCDdEe x AaBBCcDdEe cross is expected to have coloured flowers?
. The production of pigment in the outer layer of seedsof corn requires each of the three independently assorting genes A, C, and R to be represented by at leastone dominant allele, as specified in Problem 64. Thedominant allele Pr of a fourth independently assortinggene is required to convert the biochemical precursorinto a purple pigment, and its recessive allele pr makesthe pigment red. Plants that do not produce pigmenthave yellow seeds. Consider a cross of a strain of genotype A/A ; C/C ; R/R ; pr/pr with a strain of genotypea/a ; c/c ; r/r ; Pr/Pr.a. What are the phenotypes of the parents?b. What will be the phenotype of the F1?c. What phenotypes, and in what proportions, willappear in the progeny of a selfed F1?d. What progeny proportions do you predict from thetestcross of an F1?
In a species of tree, seed color is determined by four independently assorting genes: A, B, C, and D. The recessive alleles of each of these genes (a, b, C, and d) produce abnormal enzymes that cannot catalyze a reaction in the biosynthetic pathway for seed pigment. This pathway is diagrammed as follows: A White precursor Yellow ----Orange----- Red --- Blue When both red and blue pigments are present, the seeds are purple. Trees with the genotypes Aa Bb Cc Dd and Aa Bb Cc dd were crossed. (a) What color are the seeds in these two parental genotypes? (b) What proportion of the offspring from the cross will have white seeds? (c) Determine the relative proportions of red, white, and blue offspring from the cross.
In sweet peas, the synthesis of purple anthocyanin pigment in the petals is controlled by two genes, B and D.The pathway iswhiteintermediateblueintermediateanthocyanin(purple)gene Benzymegene Denzymea. What color petals would you expect in a purebreeding plant unable to catalyze the first reaction?b. What color petals would you expect in a purebreeding plant unable to catalyze the second reaction?c. If the plants in parts a and b are crossed, what colorpetals will the F1 plants have?d. What ratio of purple : blue :white plants would youexpect in the F2?
1. In corn, male sterility is controlled by maternal cytoplasmic elements. This phenotype renders the male part of corn plants (i.e. the tassel) unable to produce fertile pollen; the female parts, however, remain receptive to pollination by pollen from male- fertile corn plants. However, the presence of a nuclear fertility restorer gene F restores fertility to male-sterile lines. Using the following color-coded circles, simulate the crosses indicated below. Put the illustrations of crosses in the spaces provided. Be sure to include in the labels the genotypes and phenotypes of the offspring in each cross. Big light green circle cytoplasm Big orange circle cytoplasm Small orange circle Small half-light green-half-orange circle - Ff nucleus Small light-green circle - male-sterile - male-fertile - FF nucleus - ff nucleus a. Male-sterile female x FF male (the term male-sterile is an adjective that describes the female) b. Male-sterile female x Ff male (the term male-sterile is an adjective…
A mutation that breaks which of the following genes would be most likely to produce theanthocyanless phenotype of the green-stem Wisconsin Fast Plants (meaning no purple stems):PAL, CHS, C3H, FLS, or DFR? Explain your reasoning.
8. Kernel color in wheat is controlled by 2 pairs of genes (AABB). Determine the color of the offspring with the following genotypes: (Note: 4 contributing alleles – red; 3 contributing alleles – medium red; 2 contributing alleles – intermediate red; 1 contributing allele – red; and 0 – white AAbb x AaBb AABb x Aabb aaBb x Aabb AABb x aabb AABb x AaBb A wheat plant producing medium red seed is crossed with another plant producing intermediate red seed (refer to problem no. 8). How many individuals will be? Red Medium red Intermediate red Light red White
5) Scale color in dragons is determined by two genes. The W gene is epistatic to the G gene. The W allele is dominant and allows the production of pigment, while w is recessive and blocks pigment formation, resulting in white dragons. When pigment formation is possible, the dominant G allele results in green dragon scales, while the recessive g allele results in black dragon scales. The pigment formation pathway is shown below. (3 points) W (Enzyme 1) G (Enzyme 2) White precursor Black intermediate pigment Green pigment a. What color scales would you expect in each of the following dragons? WwGg Wwgg wwGG wwgg b. If you cross two dragons with WwGg genotype, what is the expected phenotypic ratios of the progeny? c. What kind of epistasis do we observe?
5) Scale color in dragons is determined by two genes. The W gene is epistatic to the G gene. The W allele is dominant and allows the production of pigment, while w is recessive and blocks pigment formation, resulting in white dragons. When pigment formation is possible, the dominant Gallele results in green dragon scales, while the recessive g allele results in black dragon scales. The pigment formation pathway is shown below. W (Enzyme 1) G (Enzyme 2) White precursor Black intermediate pigment → Green pigment a. What color scales would you expect in each of the following dragons? WwGg Wwgg wwGG wwgg b. If you cross two dragons with WwGg genotype, what is the expected phenotypic ratios of the progeny? c. What kind of epistasis do we observe?
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 →Blue Intermediate Enzyme D → White Intermediate Anthocyanin (purple) What color petals would you expect in a pure-breeding (homozygous) plant unable to catalyze the first 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 a certain species of flowering plants with a diploidgenome, four enzymes are involved in the generationof flower color. The genes encoding these four enzymes are on different chromosomes. The biochemical pathway involved is as follows; the figure showsthat either of two different enzymes is sufficient toconvert a blue pigment into a purple pigment.→ white → green → blue → purpleA true-breeding green-flowered plant is mated with atrue-breeding blue-flowered plant. All of the plants inthe resultant F1 generation have purple flowers. F1plants are allowed to self-fertilize, yielding an F2 generation. Show genotypes for P, F1, and F2 plants, andindicate which genes specify which biochemicalsteps. Determine the fraction of F2 plants with thefollowing phenotypes: white flowers, green flowers,blue flowers, and purple flowers. Assume the greenflowered parent is mutant in only a single step ofthe pathway
Some sweet-pea plants have purple flowers and others have white flowers. A homozygous variety of sweet pea that has purple flowers is crossed with a homozygous variety that has white flowers. All the F1have purple flowers. When these F1 self-fertilize, the F2 appear in a ratio of 916 purple to 716 white. a.Draw a hypothetical biochemical pathway to explain the production of purple and white flowers in sweet peas.