Incomplete and Co-Dominance Review Worksheet
1. Oompahs can have red, blue, or purple hair. The allele that controls this trait is INCOMPLETELY DOMINANT, where purple hair is caused by the heterozygous condition. Show a "key" for the genotypes and phenotypes of hair color.
2. Orville Oompah has purple hair and is married to Opal Oompah who brags that she has the bluest blue hair in the valley. How many of Opal’s children will be able to brag about their blue hair also? __ How many will take after their father? ____ (Show work!)
3. One of Opal's children is born with shocking red hair. Is Orville Oompah the father of this child? ______But wait, Opal swears that she has been faithful, she claims the hospital goofed and got her baby mixed with someone else's. Is Opal the mother of the red haired child? ______(Show work!)
4. Olga Oompah has red hair and marries Oliver Oompah who has blue hair. They have 32 children. What is the color of these children's hair? ______(Show work!)
5. Olivia Oompah is married to Odo Oompah. Both of them have purple hair. They have 100 children. What is the hair color of their children and in what proportion? Red ______Blue ______Purple ______(Show work!)
6. In the land of Oompah, blue hair is highly valued. Blue haired Oompahs get special benefits. Oscar Oompah has purple hair but he wants a wife that will give him children with blue hair. What color hair should he look for in a wife? ______If he can’t find this type of Oompah what should be his second choice? ______(Show work!)
1. In humans, wavy hair (CS) results by the co-dominant situation of curly hair (C) and straight hair (S). What are the possible results if a curly-haired man and wavy-haired woman have children.
2. In iris, purple (p) is incompletely dominant over white (w). What would be the results of a cross if both parents were pale lavender (heterozygous-pw)?
3. In crocus flowers, white (W) and purple (P) colors are co-dominant, and result in a purple and white striped flower when both genes are present. What are the possible results from the cross-pollination of a striped crocus with a white crocus?
4. In cattle, red (r) is incompletely dominant over white (w) hides. Roan in the name of the color that results from incomplete dominance. What are the possible results if a white male mates with a roan female?
Spongebob loves growing flowers for his pal Sandy. Her favorite flowers, Poofkins, are found in red, blue, and purple. Use the information provided and your knowledge of incomplete dominance to complete the sections below.
1. Write the correct genotype for each color if R represents a red gene and B represents a blue gene
Red: ______Blue: ______Purple: ______
2. What would happen if Spongebob crossed a red Poofkin with a blue Poofkin? Complete the punnett square to determine the chances of each flower color.
Spongebob and his pal Patrick love to go jellyfishing at Jellyfish Fields. The fields are home to a special type of green jellyfish known as Goobers and only really great jellyfishermen are lucky enough to catch some on every trip. Many of the jellyfish are yellow (YY) or blue (BB), but some end up green as a result of incomplete dominance. Use this information to help you complete the following situations.
1. What would happen if Spongebob and Patrick crossed two “goobers” or green jellyfish? Complete the Punnett square to help you determine the probability for each color of jellyfish.
2. What would happen if they crossed a yellow jellyfish with a goober? Complete the Punnett square to help you determine the probability for each color of jellyfish.