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What are nucleotide segments of DNA molecules that make up genes and are expressed in the phenotype of an organism?
These are called Exons - ex for expressed. The 'gene spacers' that are removed from the messenger Rnas and are not expressed are called Introns.
What are needed to transfer a gene through a DNA molecule?
Genetics engineering is needed to transfer genes through DNA molecules.
How do genes make a phenotype?
They are expressed.
Which genes are dominant and which are recessive?
Dominant genes are always expressed in preference to recessive genes in cased where both genes are present.
Are genes molecules or not?
Yes they are large complex molecules.
What molecule carries out our genes?
DNA molecules carry out our genes.
What genes are expressed even when present on only one chromosome?
dominant genes
How is the way hox genes are expressed in mice different to the way they are expressed in fruit flies?
Hox genes in mice and fruit flies are expressed similarly in that the genes themselves are similar enough to trade places and still function. The genes are expressed different because although you can switch the genes around, the outcome will result in the improper physical characteristic.
An expressed gene is one that?
is transcribed into RNA. Promoters (I think that's what you meant, right?) don't function as genes; they stand as a signal for RNA polymerase to begin transcription of the actual gene, which begins about 25 base pairs downstream of the promoter region in eukaryotic DNA. Expressed genes DO code for proteins, but not all protein-coding genes are expressed. For example, the cells in your heart contain genes that code for proteins needed only in your liver. While those genes definitely code for proteins, they're not expressed. Expressed genes (and non-expressed genes, Ke$ha Looks like a man, for that matter) are made of DNA, not mRNA.
Are Genes present in heterochromatin readily expressed?
No. Heterochromatic regions of DNA are not readily expressed as they are densely packaged. Some of these regions do not code for genes at all.
What gene is always expressed?
Dominant genes will always be expressed however recessive genes would need to be inherited from both parents
What trait is is expressed when two diffrent genes for the same trait are present?
A dominant trait is expressed when two different genes for the same trait are present.
