Q. In summer squash if you cross different varieties of true breeding sphere shaped squash, you get a disk shaped progeny. What phenomenon is seen here?

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Q. Which one of the following summer squash would be true breeding?

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Q. If you cross a true breeding long with a true breeding disc shaped squash, what will you get in the F1?

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Q. If you cross two sphere shaped squash, you always get a disc.

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Q. You cross two heterozygous disc shaped squash. What will be the ratio obtained?

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Q. The cross between a true breeding sphere shaped and a long shaped squash gives 30 sphere squash in F2. What is the total number of expected progeny?

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Q. In case of two gene interaction, the gene which is masking the expression of another is called_____________ and the gene whose expression is masked is called_______________

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Q. Epistasis is the interaction between_____________ genes.

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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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