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A researcher has crossed two white-fur mouse strains, and all the F1 offspring have been black-fur. They then crossed the F1 mice, and the F2 generation shows a ratio among 200 offspring: 130 black fur, 70 white fur. The researcher hypothesizes that the two genes, A and B, are involved in controlling fur colour. Both genes are involved in the production of pigment, and mutations in either gene (a or b) result in a lack of pigment (white fur). However, the normal function of both genes is required for pigment production (black fur).What genetic phenomenon is the researcher most likely observing, and which of the following explanations best fits the observed results?AComplementary gene action, where two genes must both be functional for pigment production, leading to a 9:7 phenotypic ratioBDominant epistasis, where a dominant allele in one gene masks the effect of the other gene, leading to a 13:3 phenotypic ratioCRecessive epistasis, where a recessive allele in one gene masks the effect of the other gene, leading to a 9:4:3 phenotypic ratioDAllelism, where mutations in the same gene cause the white fur phenotype, leading to a 3:1 phenotypic ratio

Name: a researcher has crossed two white fur mouse strains and all the f1 offspring have been black fur they then crossed the f1 mice and the f2 generation shows a ratio among 200 offspring 130 bl 94883
Uploaded: 2023-09-22T02:27:29-08:00
Duration: 3 min 40 s
Channel: Bryan Valdivia
Description: a researcher has crossed two white fur mouse strains and all the f1 offspring have been black fur they then crossed the f1 mice and the f2 generation shows a ratio among 200 offspring 130 bl 94883

          A researcher has crossed two white-fur mouse strains, and all the F1 offspring have been black-fur. They then crossed the F1 mice, and the F2 generation shows a ratio among 200 offspring: 130 black fur, 70 white fur. The researcher hypothesizes that the two genes, A and B, are involved in controlling fur colour. Both genes are involved in the production of pigment, and mutations in either gene (a or b) result in a lack of pigment (white fur). However, the normal function of both genes is required for pigment production (black fur).What genetic phenomenon is the researcher most likely observing, and which of the following explanations best fits the observed results?AComplementary gene action, where two genes must both be functional for pigment production, leading to a 9:7 phenotypic ratioBDominant epistasis, where a dominant allele in one gene masks the effect of the other gene, leading to a 13:3 phenotypic ratioCRecessive epistasis, where a recessive allele in one gene masks the effect of the other gene, leading to a 9:4:3 phenotypic ratioDAllelism, where mutations in the same gene cause the white fur phenotype, leading to a 3:1 phenotypic ratio

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