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Diagram for inheritance of PRA (Progressive Retinal Atrophy)reproduced with kind permission from Swedish Siamese Society (SES) PRA is a hereditary eye disorder where the retina slowly degenerates, making the cat blind. This page illustrates the inheritance.
![]() = Normal - cat without the gene for PRA, does not pass on the gene for PRA
![]() = Carrier - cat with one gene for the disorder, can pass this gene on to progeny, will not develop PRA
![]() = Affected - cat with two genes for the disorder, will pass this gene on to progeny, will also develop PRA ________________________________________________________________________________
Normal cat mated with normal cat
100% of the progeny will be normal/without the gene for PRA _______________________________________________
Normal cat mated with carrier
50% will be carriers, 50% will be normal _______________________________________________ NB! The following combinations are not recommendable and should not be done
Carrier mated with carrier
25% of the progeny will get PRA, 50% will be carriers and 25% will be normal _______________________________________________
Carrier mated with affected cat (has PRA)
50% of the progeny will be affected and 50% will be carriers _______________________________________________
Affected cat mated with normal cat
100% of the progeny will be carriers _______________________________________________
Affected cat mated with affected cat
100% of the progeny will be affected _______________________________________________ Copyright © Svenska Siamessällskapet 2011 |
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