Why is SpongeBob's head like a box when his parents both have circular heads?

Answer 1

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.

Answer 2

SpongeBob has a box-shaped head because that is how his creators drew him. Most sponges are square, so SpongeBob has a square head, and his parents have circular heads because that is also how their creators drew them. There really isn't any other explanation for this strange phenomenon.

Answer 3

The creator of the character, Hillenburg liked drawing marine life especially sponges which he thought were the "oddest of all" these creatures. However the unaesthetic lumpy shape of natural sponges did not seem right for the spirit for the character. He examined other potential candidates for the sponge character settling on a sink sponge — like his creation it's so clean and square, the moral and social image project by the innocent and un-hip SpongeBob.

Answer 4

Because he is a regular sponge shape. He comes to life underwater!