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. 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 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 G allele 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 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?

Human Heredity: Principles and Issues (MindTap Course List)

11th Edition

ISBN:9781305251052

Author:Michael Cummings

Publisher:Michael Cummings

Chapter11: Genome Alterations: Mutation And Epigenetics

Section: Chapter Questions

Problem 20QP: The cystic fibrosis gene encodes a chloride channel protein necessary for normal cellular functions....

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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 W (Enzyme 1) G (Enzyme 2) White precursor Black intermediate pigment Green pigment а. 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?
Star eye A peculiar eye condition known as "star” is manifested as a dominant gene in Drosophila. Its recessive allele R* produces the normal eye of wild type. The expression of R can be suppressed by the dominant allele of another locus, Ru-R. Ru-R*, as the recessive allele of the said locus, has no inhibitory effect on R*. When a normal-eyed male of genotype Ru-R Ru-R RR is crossed to a homozygous wild-type female of genotype Ru-R* Ru-R* R*R*, what phenotypic ratio is expected in the F2?
You are a studying the genetic basis of horn color in unicorns. Gene C determines the color of pigment destined for the horn by converting a pink precursor into a purple pigment. C- individuals make purple pigment whereas cc individuals accumulate pink precursor. Gene D ensures the deposition of the pigment into the horn cells, such that D- individuals have a colored horn (purple or pink), whereas dd individuals have a white horn. You breed two purple horned unicorns to each other (CcDd). Assuming Gene C and Gene D are unlinked, what is the probability that the baby unicorn has a purple horn? Please express your answer to 2 decimal places (e.g. 0.69).
Gene Vellow Pigment ,in some plants White By-product ENZYME Rabbits that have the active form of this gene produce white-colored fat. Rabbits who have the defective form of this gene produce yellow- colored fat. However, there is an environmental complication of this trait. (See the following questions.) 1. If a rabbit that has the active form of the gene is fed plants with the pigment, what color is its fat? 2. If a rabbit with the defective gene is fed plants with the pigment, what çolor is its fat?
1. In a plant species, flower-colour is determined by the biochemical pathway shown below: E В C Colourless orange pink purple green 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 D, while the recessive allele e has no effect. a) Determine the F1 and F2 phenotypes from a cross between AABBccDDEE and AABBCCDDee plants. 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 a dominance series. Red (R) is dominant to black (Rb), black is dominant to white (RW) and white is dominant to tan (r) (R > RD > RW > r). Colour variation in this species…
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1. In a plant species, flower-colour is determined by the biochemical pathway shown below: E A В C D Colourless purple orange red yellow 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 D, while the recessive allele e has no effect. а) 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?
Gene Interaction and Epistasis Hair color is due to the presence of melanin. There are two types of melanin produced by melanocytes. One is eumelanin, which is responsible for black (homozygous), brown (heterozygous), and blond (recessive) hair colors. The other is pheomelanin, which is responsible for red hair color. During melanin synthesis, MCR1gene converts pheomelanin to eumelanin. However, a variant of the MCR1 gene (MCR1variant), prevents this conversion. A cross between a blond-haired mother and a red-haired father produced 100% brown-haired children. When they came of age, one child married a double heterozygote, and both were blessed with 7 children; 2 with black hair, 2 with brown hair, 1 with blond hair, and 2 with red hair. Using the 7-step method, determine the genotypes of the P1, the F1, and the F2s. BOX your answers (if handwritten) or HIGHLIGHT your answers (if encoded). STEP 1: ________________________________________________________ STEP 2:…
The Xb locus on Alouatta genus, the howler monkey X chromosome has 2 alleles, b+ and b. The b+ allele causes the presence of the Xb surface protein on their granulocyte cells, while the recessive allele b which does not allow the antigen to appear. The Xb locus is at 15 centimorgans, from the GRG locus. The GRG locus produces a normal enzyme activity. Individual howler monkeys with one form of an eye condition have the grg/grg genotype, with the males grg/Y presenting the condition. A male howler monkey with the eye condition caused by this enzyme mutation and no Xb antigen has a normal female howler monkey daughter with Xb antigen. This howler monkey female daughter is expecting a little howler monkey from the mating from a male howler monkey from a different tree. A) Determine the genotype of the howler monkey daughter, from the problem. B) Determine the types and percentages of each gametes in oogenesis produced of the howler monkey daughter female, based on the map distance given.…
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?
You are interested in studying position effect variegation in Drosophila using the chromosome depicted below: Deactivation of the w+ gene gives a white eye phenotype and deactivation of the rst+ gene gives a rough eye phenotype; the normal phenotypes are red and smooth. Because the rst+ and w+ genes have now been placed close to a heterochromatic domain, some sections (or sectors) of the eye display mutant phenotypes due to gene deactivation while others display the normal, wild type phenotype. Which phenotype would you not expect to see rst w Inverted X chromosome white smooth eye sectors white rough eye sectors red smooth eye sectors red rough eye sectors
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