Q. Epistasis is the interaction between two genes producing a new phenotype.

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Q. What is the dihybrid phenotypic ratio for recessive epistasis in an F22 generation?

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Q. In mouse agouti locus is hypostatic to pigment development locus. If C is for pigment development, and A is for agouti, and recessive alleles in agouti locus gives black colour and recessive in pigment locus gives white colour, what will be the phenotype of A/- c/c and a/a c/c.

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Q. The cross between a white mouse and a black mouse _______________

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Q. Which one of the following has dominant allele in both gene locus?

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Q. Coat colour in Labrador retriever is controlled by epistasis. B specifies black pigment, b is for brown pigment (recessive) and E locus determines the expression of B locus. Which one of the following is wrong?

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Q. Epistasis can produce a ratio of 12:3:1.

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Q. In case of dominant epistasis which of the following will have the same expression, when A is the epistatic locus?

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Q. Dominant epistasis ratio with A as epistatic gene 12:3:1 corresponds to ________________

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Q. Which one of the following is not the case of epistasis?

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Q. Which of the following is incorrect about the graying of coat colour of horse?

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Q. In case of summer squash, the W locus shows dominant epistasis over the Y locus. W locus develop white colour while /- give yellow and y/y gives green. If you cross a yellow and a green summer squash you can’t get______________

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Q. In case of summer squash which of the following is not right.

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Q. Flower colour in sweet pea shows duplicate epistasis, if purple colour is dominant what is the F2 ratio?

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Q. Which of the following condition in recessive duplicate epistasis will give the odd phenotype?

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Q. If you cross two different strains of white flower you may get a purple flower in a sweet pea plant.

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Q. Choose the off one out in case of duplicate recessive episasis.

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Q. If you self cross purple flower in sweet pea, you will get__________

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Q. Self crossing a white flower of sweet pea would give a ____________________

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Q. In sweet pea a white substance is first converted to a ___________ substance by 1st gene and that to a ______________ substance by 2nd gene to give a purple flower.

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