Where is a particular gene located on a chromosome is it the allele dihybrid locus diploid or autosome?

Answer 1

The majority of Chromosomal DNA is non-coding and the location of genes are very important and affect the way they are passed on.

Here is a response from a geneticist, in point form:

1. Both autosome and sex chromosomes contain genes.

2. A gene is a strand of DNA, a fragment of chromosome

3. Not all of DNA on chromosome contains gene signals. A DNA sequence that

contains gene signals are called coding sequence or exon.

4. Usually, a coding sequence or exon for a gene is broken into several pieces by introns

(nonsense DNA ) on chromosome.

5. During transcription, the whole DNA strand for a gene is transcribed into mRNA. An editing process in cytoplasm removes the nonsense introns. The remaining mRNA will be translated into protein.

6. For diploid organism, there are two sets of DNA strands, or two alleles for a particular gene. Both alleles can be expressed (translated into protein).

7. Very often, we use the word gene for both DNA double strands (two alleles) and a specific allele. This may cause confusion.