The Open Door Web Site
Bateson and Punnett discovered genes which did not obey Mendel's Second Law
The parental combinations of alleles (purple long and red round) seem to be inherited as almost a 3:1 ratio (i.e. as though they were behaving as a single character). These genes are called linked genes.
That is the LOCI for these genes are linked on the same chromosome.
But if these genes were perfectly linked together they would stay in their parental combinations. There would be no Purple Round or Red Long. These combinations have come about because of crossing over between the linked alleles on their chromosomes during Meiosis I. These are called recombinants.
Are there any other recombinants?
Yes, hidden amongst the Purple Long plants:
The genotype FfLl does not tell us enough about linked genes.
Genotypes for linked genes can be shown as . This is an example of a parental combination. This genotype would give the same phenotype as , which is an example of a recombinant.
The Open Door Web Site is non-profit making. Your donations help towards the cost of maintaining this free service on-line.
Donate to the Open Door Web Site using PayPal