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Round is the dominant gene, while square is the recessive. Spongebob's parents have a heterozygous round genotype. This means they both carry the Rr dominant/recessive genes they inherited from their parents. If you do a punnet square for these 2 genotypes breeding you will see that 1 of 4 offspring would be rr or recessive/recessive like Spongebob. Most of the offspring would be expected to be round. While we are on the subject, don't forget that sponges reproduce asexually, which means they have only one biological parent. The offspring have the same genetic code as the parent. Unless SpongeBob and his parents are a different genus of sponges, he is either a very rare mutation (from either parent) , or he is adopted, or he had unmentioned major surgery in his infancy.

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