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Transgenic Drosophila can be created by microinjection of DNA into the embryos. These embryos are at which stage of development?

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Transgenic Drosophila can be created by microinjection of DNA into the embryos. These embryos are at which stage of development?

(a) One-cell stage

(b) Pre-blastoderm stage

(c) Blastoderm

(d) Morula

The question was asked in an interview for internship.

My question is from Drosophila in division Using Other Organisms of Genetic Engineering

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Right answer is (b) Pre-blastoderm stage

Explanation: Transgenic Drosophila can be created by microinjection of DNA into the embryos. The embryo should be at pre-blastodermal stage. Other developmental stages such as blastoderm and morula follow the pre-blastodermal stage.

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