6.2.7

• autosomal linkage - gene loci present on the same autosome (non-sex chromosome) that are often inherited together
• autosomal linkage - gene loci present on the same autosome (non-sex chromosome) that are often inherited together
• Linkage

  there are more genes than chromosomes in a genome so when two or more loci are on the same chromosome, they are said to be linked

  the chromosome, not the gene, is the unit of transmission during sexual reproduction, therefore linked genes are not free to undergo independent assortment; they are usually not inherited together as a single unit

  in eukaryotic organisms the number of linkage groups is the same as number of pairs of autosomes - for humans there are 22 linkage groups
• inheritance of autosomally linked genes with no crossing over

  if linked genes are not affected by crossing over of non-sister chromatids during prophase 1, then they’re always inherited as one unit

  • if you don’t get the ratio 9:3:3:1, it is an autosomal linkage

  
• inheritance of autosomally linked genes with crossing over