Punnett Squares Practice

1. Growlie and Screech Growlie and Screech are monsters that have just gotten married. One horn is the dominant trait in monsters and two horns is the recessive trait. Both Growlie and Screech have one horn, but are carriers for the two horn trait. What is the probability that they will have two horned babies? Punnett Square H h H HH Hh h Hh Hh What is the probability of Growlie and Screech having 1 horned offspring? 0% 25% 50% 75% 100% What is the probability of Growlie and Screech having 2 horned offspring? 0% 25% 50% 75% 100% 2. WEREWOLVES In werewolves, having black fur is a dominant trait and having brown fur is a recessive trait. Slasher’s family has had black fur for generations, so he is a purebred with a genotype of BB. Midnight also has black fur, but she is not a purebred. She has agenotype of Bb. If Slasher and Midnight had a pup, what are the possible genotypes and phenotypes for its fur color?Slasher's letters (BB) are already on the Punnett Square at the top. Don't forget to add Midnight's letters on the left-hand side. Punnett Square B B B BB BB b Bb Bb What is the probability that Slasher and Midnight's offspring will have black fur? 0% 25% 50% 75% 100% 3. Snakes Lucy a snake breeder recently acquired a normal-looking female corn snake that is a carrier for a recessive albino trait. She bred the female with an albino snake and wants to know what the probability is of those two snakes having albino babies. Use (A) for the dominant trait and (a) for the recessive trait.The genes for the male albino father are already on the Punnett square. Don't forget to add the letters for the female carrier mother. Punnett Square A a a Aa aa a Aa aa The offspring have a 50% chance of being albino and a 50% chance of having normal corn snake coloration. 4. Zombies Moving slow is dominant in zombies; the ability to move quickly is recessive. Rob is a very slow-moving zombie. He has a genotype of FF. Bitey comes from a long line of fast-moving zombies. She has a genotype of ff. Rob and Bitey want to know the possible speeds of their future baby zombies. Find the genotypes and phenotypes. Punnett Square f f F Ff Ff F Ff Ff 0% chance that their offspring will be fast-moving Zombies.100% chance that their offspring will be slow-moving Zombies. 5. Pumpkins In pumpkins, white skin color (J) is dominant to yellow skin color (j). Jack is a pumpkin with white skin. His genotype is JJ. Sally is a pumpkin with yellow skin. Her genotype is jj. Jack and Sally want to know what percentage of their kids could have yellow skin.Put Jack's letters on the first column on the LEFT.Put Sally's letters on the top row. Punnett Square j j J Jj Jj J Jj Jj When Jack and Sally have offspring they have a 100% chance of having offspring with the DOMINANT trait. Which means that all of their children will be white in color. 6. Witches and Warlocks Having big, hairy face warts is a dominant trait in witches and warlocks. Gretchen loves her giant face wart with its long, spiky hair. She has a genotype of Hh. Moss, with his recessive genotype of hh, sadly has no face warts. He is afraid he will pass on this trait to his children. Help him find out if it is possible his babies will also be born without face warts. Punnett Square H h h Hh hh h Hh hh They have a 50% chance of having offspring with face warts and a 50% chance of having offspring without face warts. So can they have children without lovely warts? Yes!