Help clarify my undestanding of genes and alleles (1 Viewer)

[Tim035]

Would I be right in saying an allele is a single form for a pariticular Trait eg. (t) for short plant and (T) for tall plant.
And thus a gene would be (TT) or (tt) or (Tt).

 

[punk_tartan]

yeah tahts correct, but it would be better saying that an allele is one member of a pair of traits required to make the gene, because the trait muct have 2 alleles and hence a gene to show that trait

 

[jims]

a gene is a segment of DNA which exists at a particular locus on a chromosome and codes for particular proteins (or just one). As autosomal genes are duplicated (1 maternal and 1 paternal chromosome), you have 2 genes directing the production of each protein(s).

an allele is a variation of the gene. there can be many more than 2 variaties of a gene (alleles) in a population but each individual would only possess either 1 (homozygous; same allele at both loci) or, at most, 2 (heterozygous; different alleles on the maternal and paternal chromosomes) alleles of a gene.

a trait is not always determined by a single gene. Height, for example, is the combined affect of many genes.

hope this helps.

 

[angmor]

just remember the allele is a variation of the gene, and the gene is the trait which will be expressed.

 

[beautiful bethy]

everyone has a gene for eye colour, on a chromosome
everyone has an allele for eye colour, blue green etc.

Gene is a section of DNA that codes for a characteristic
Allele refers to genes where varieties of a characteristic exists in a population

http://community.boredofstudies.org/newreply.php?do=newreply&noquote=1&p=2337367

 

[Dr_Doom]

Allele = alternate form of a gene