BRAINCAKEAutosomal Linkage and Recombinant Offspring
An autosome is any chromosome that is not a sex chromosome. Two genes are autosomally linked when their loci are on the same autosome.
Linked genes do not assort independently in meiosis. Their alleles tend to be inherited together, because they are carried on the same chromosome into the same gamete. As a result, a dihybrid cross involving linked genes does not give the expected 9 : 3 : 3 : 1 (or 1 : 1 : 1 : 1 in a test cross). Instead, most offspring have the same combinations of alleles as the parents.
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Key terms in this lesson
- allele
- One of two or more alternative versions of a gene, occupying the same locus on homologous chromosomes.
- heterozygous
- Having two different alleles of a particular gene.
More in Genetics and Variation
- Species
- Allopatric Speciation
- Sympatric Speciation
- Artificial Selection
- Codominance
- Codominance Genetic Crosses
- Multiple Alleles
- Multiple Allele Crosses - ABO Blood Groups
All 41 lessons in Genetics and Variation · All AQA A-level Biology topics