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What else can I help you with?
How is the way hox genes are expressed in mice different to the way they are expressed in fruit flies?
In mice, hox genes are organized in a cluster on the chromosome and are expressed in a specific order that correlates with their position on the cluster. In fruit flies, hox genes are also organized in a cluster but are regulated by different transcription factors and signaling pathways compared to mice. Fruit flies have fewer hox genes compared to mice, and their expression patterns are more influenced by the body segment they control.
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.
What is homozygous and what is hetrozygous?
Homozygous: genes are similar Hetrozygous: genes are not similar
What genes are expressed even when present on only one chromosome?
dominant genes
What molecules are genes expressed through?
aids
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.
What is the differencs between dominant and recessive?
Dominant genes are genes that are expressed more readily than recessive genes, i.e. if you had a genotype that was AaBb, A being for brown hair, a for blonde hair, B for brown eyes, b for blue, you would have brown hair and brown eyes as the genes for those phenotypes are dominant. For recessive genes to be expressed in the phenotype the gamete needs to have recessive genes for both "slots", e.g. AA for blonde hair to be expressed or bb for blue eyes to be expressed. Edd
Which is true of transcription factors?
They control which genes are expressed.
