A.) An allele is a version of a gene that can be expressed as a phenotype.
Struggled with this earlier but because of the high altitude only some animals can live there and thrive because of the lower oxygen levels
<span>Gene
expression is taking place when chromatin is less condensed. Highly compacted
chromatin is not accessible to the enzymes involved in DNA transcription,
replication and repair because transcription is being inhibited or inactive. Therefore,
looser configuration permits transcription or gene expression to take place. </span>
To show he presence of a trait you would need to follow it through multiple generations in a pedigree.
