BRAINCAKEAutosomal Linkage and Recombinant Offspring
Genes on the same autosome (a chromosome that is not a sex chromosome) are linked. Autosomal linkage means the alleles on one chromosome tend to be inherited together, because they do not assort independently in meiosis.
In a dihybrid cross of two unlinked genes, AaBb × aabb gives a 1 : 1 : 1 : 1 ratio. If the genes are linked, with A and B on one chromosome and a and b on the other, most gametes are AB or ab (the parental combinations). The offspring are mostly like the parents, and the 1 : 1 : 1 : 1 ratio is not seen.
Sign in free to see the rest of this lesson, the R.E.C.I.P.E. recall steps and the quiz
BrainCake is free. Make an account in seconds and pick up where this page stops.
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 OCR A-level Biology topics