How the positive and negative DNA markers are used in genetic engineering?

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People who can roll their tongues contain a dominant allele for tongue rolling. If people do not contain the tongue rolling gene, then they cannot roll their tongue no matter how hard they try. Consider the following situation: If a homozygous dominant tongue roller mates with a homozygous recessive non-tongue roller, then what is the probability of the offspring inheriting the tongue rolling gene?

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what is Avian flu threat? what are its symptoms?

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Can Genetically Engineered food benefit the world?

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Explain steps involved in transcription?

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How can all organisms share the same 4 bases DNA and still be so diverse?

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Are dominant genes related to dominant traits?

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How is an allele different from a gene?

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Promoters of housekeeping genes contain variable numbers of GC boxes, but neither TATA nor CCAAT boxes.Inwhat way these properties of housekeeping promoters are helpful?

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In cucumbers normal leaves (N) are dominant to curled leaves (n) and elongated fruit (L) is dominant to spherical fruit and these genes are linked on the same chromosome. If a pure-breeding normal-leaved, elongated fruit cucumber is crossed with a curled-leaved, spherical fruit cucumber, what will be the phenotype of the F1? the phenotypic ratio of the F2?

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what are transpoons?

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• Is male child having more genital sequence as of father or mother?

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