Bikini Bottom Genetics (From Science Spot)

Master Punnett Squares with this fun genetics worksheet!

Punnett Square SpongeBob SquarePants recently met SpongeSusie Roundpants at a dance. SpongeBob is heterozygous (Ss) for his square shape, but SpongeSusie is round (ss). Create a Punnett Square to show the possibilities that would result if SpongeBob and Sponge Susie had children. Punnett Square S s s Ss ss s Ss ss Refer to the Punnett Square above, what are the chances of a child with a square shape? (Square is dominant) 25% 50% 75% 100% What are the chances of a child with a round shape? (square is dominant) 25% 50% 75% 100% Punnett Square Patrick met Patti at the dance. Both of them are heterozygous for their pink body color, which is dominant over a yellow body color. Create a Punnett square to show the possibilities that would result if Patrick and Patti had children. Punnett Square P p P PP Pp p Pp pp What are the chances of a child with a pink body? (pink is dominant over yellow?) 25% 50% 75% 100% What are the chances of a child with a yellow body? (pink is dominant over yellow) 25% 50% 75% 100% Punnett Square Everyone in Squidward's family has light blue skin, which is the dominant trait for body color in his hometown for Squid Valley. His family brags that they are a "purebred" line. He recently married a nice girl who has light green skin, which is a recessive trait. Create a Punnett square to show the possibilities that would result if Squidward and his new bride had children. Use B to represent the dominant gene and b to represent the recessive gene. Punnett square B B b Bb Bb b Bb Bb What are the chances of a child with light blue skin? 0 in 4 (0%) 1 in 4 (25%) 2 in 4 (50%) 3 in 4 (75%) 4 in 4 (100%) What are the chances of a child with light green skin? 0 in 4 (0%) 1 in 4 (25%) 2 in 4 (50%) 3 in 4 (75%) 4 in 4 (100%) Would any of Squidward's children be still considered to be purebreds? yes no Assume that one of Squidward's sons, who is heterozygous for the light blue body color (Bb), married a girl who was also heterozygous. Create a Punnett Square to show the possibilities that would result if they had children. Punnett Square B b B BB Bb b Bb bb What are the chances of a child with light blue skin color? 0% 25% 50% 75% 100% What are the chances of a child with green skin color? 0% 25% 50% 75% 100% Punnett Square Mr. Krabbs and his wife recently had a Lil' Krabby, but it has not been a happy occasion for them. Mrs. Krabbs has been upset since she first saw her new baby who had short eyeballs. She claims that the hospital goofed and mixed up her baby with someone else's baby. Mr. Krabs is homozygous for his tall eyeballs (TT), while his wife is heterozygous for her tall eyeballs (Tt). Some members of her family have short eyeballs, which is a recessive trait. Create a Punnett square to find out if they could have a baby with short eyeballs. Punnett Square T T T TT TT t Tt Tt Do any of their possible children have short eyeballs? yes no