Given the inheritance pattern of coat color in rats described in Problem $17,$ predict the genotype and phenotype of the parents who produced the following offspring: (a) $9 / 16$ gray: $3 / 16$ yellow: $3 / 16$ black: $1 / 16$ cream (b) $9 / 16$ gray: $3 / 16$ yellow: $4 / 16$ albino (c) $27 / 64$ gray: $16 / 64$ albino: $9 / 64$ yellow: $9 / 64$ black: $3 / 64$ cream (d) $3 / 8$ black: $3 / 8$ cream: $2 / 8$ albino (e) $3 / 8$ black: $4 / 8$ albino: $1 / 8$ cream
Added by Kelly P.
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The genotype of the parents would be $AaBb$ (gray). So, the parents are both gray. Show more…
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The inheritance pattern for coat color of two independent genes in rats is the following: A_ B_ Gray A_ bb Yellow aa B_ Black aa bb Cream There is a third gene on a separate chromosome which determines if color is produced in the fur with deposition of color C_ and no color (albino) cc. Predict the phenotypes and genotypes of the parents which would produce the following offspring. A) 9/16 Gray, 3/16 Yellow, 3/16 Black, 1/16 Cream B) 9/16 Gray, 3/16 Yellow, 4/16 Albino C) 27/64 Gray, 16/64 Albino, 9/64 Yellow, 9/64 Black, 3/64 Cream
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EPISTASIS: In rats, the following genotypes of two independently assorting autosomal genes determine coat color: A-B: Gray A-bb: Yellow aaB: Black aabb: Cream A third gene pair on a separate chromosome determines whether or not any color will be produced. CC: Allows Color Cc: Allows Color cc: No Color = Albino Determine the F1 phenotypic ratio of the cross: AaBbCc X aaBbcc Predict the genotypes and phenotypes of the parents who produced these offspring: 9/16 gray, 3/16 yellow, 4/16 albino. NOTE: USE FORK LINE METHOD, and how you got to your answer.
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In rats, gene B produces black coat color if the genotype is B–, but black pigment is not produced if the genotype is bb. At an independent locus, gene D produces yellow pigment if the genotype is D–, but no pigment is produced when the genotype is dd. Production of both pigments results in brown coat color. If neither pigment is produced, coat color is cream. Determine the genotypes of parents of litters with the following phenotype distributions. a. 4 brown, 4 black, 4 yellow, 4 cream b. 3 brown, 3 yellow, 1 black, 1 cream c. 9 black, 7 brown
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