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What is Pleiotropy?

In Drosophila...

Question

In Drosophila, gene for white eye mutation is also responsible for de-pigmentation of body parts. Thus a gene that controls several phenotypes is called as

A

Oncogene

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B

Epistatic gene

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C

Hypostatic gene

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D

Pleiotropic gene

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E

Sex-linked gene

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Solution

The correct option is E Pleiotropic gene
White eye mutation in Drosophila result in depigmentation in many other parts of the body. This is an example for pleiotropic effect. It is caused by pleiotropic genes. When one gene has multiple effects it is called as pleiotropic gene.

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Q. In Drosophila gene for white eye colour is also responsible for depigmentation of body parts. It is an example of

Q. Assertion (A): In Drosophila, the recombination frequency of the genes responsible for the eye colour and wing size is more than that of body colour and eye colour.
Reason (R): In Drosophila, the gene responsible for eye colour is more closely located to the gene for body colour as compared to the gene for wing size.
[0.7 mark]

Q. Following are the observations of Morgan’s dihybrid cross. Fill in the blanks with most appropriate findings.
1) The genes responsible for white eye color and that for yellow body were very ____i____ linked. _____ii____ of the F2 generation had parental phenotype while __iii_______ of F2 offsprings had the recombinant phenotype.
2) The genes responsible for white eye color and that controlling miniature wings were ___iv_____ linked. Percentage of F2 progenies showing parental and recombinant phenotypes were ____v_____ and ____vi_____ respectively.

Q. Following are the observations of Morgan’s dihybrid cross. Fill in the blanks with the most appropriate findings.
1. The genes responsible for white eye color and that for yellow body were very ____i____ linked. _____ii____ of the

F_{2}

generation had parental phenotype while __iii_______ of

F_{2}

offspring had the recombinant phenotype.
2. The genes responsible for white eye color and miniature wings were ___iv_____ linked. Percentage of

F_{2}

progenies showing parental and recombinant phenotypes were ____v_____ and ____vi_____ respectively.

Q. Assertion: The red eye color in Drosophila is dominant over white eye

Reason: The gene for white eye is present on the X chromosome and both the gene and trait is said to be X-linked

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