Download Name Bikini Bottom Genetics Worksheet #3 Incomplete Dominance

Name ___________________________
Bikini Bottom Genetics
Worksheet #3
Incomplete Dominance (Intermediate Inheritance)
SpongeBob loves growing flowers for his pal Sandy! Her favorite flowers, Poofkins, are found in red (PR), blue
(PB), and purple. Use the information provided and your knowledge of incomplete dominance to complete
each section below.
1. What would happen if SpongeBob crossed a Poofkin with red flowers with a Poofkin with blue flowers?
Complete the Punnett square to determine the chances of each flower color.
A. Give the genotypes and phenotypes for the offspring.
B. What percentage of the plants would have red flowers?
_____ %
C. What percentage of the plants would have purple flowers?
_____ %
D. What percentage of the plants would have blue flowers?
_____ %
2. What would happen if SpongeBob crossed two Poofkins with purple flowers? Complete the Punnett
square to show the probability for each flower color.
A. Give the genotypes and phenotypes for the offspring.
B. What percentage of the plants would have red flowers?
_____%
C. What percentage of the plants would have purple flowers?
_____ %
D. What percentage of the plants would have blue flowers?
_____ %
3. What would happen if SpongeBob crossed a Poofkin with purple flowers with a Poofkin with blue flowers?
Complete the Punnett square to show the probability for plants with each flower color.
A. Give the genotypes and phenotypes for the offspring.
B. If SpongeBob planted 100 seeds from this cross, how many should he expect
to have of each color?
Purple flowers - ______ Blue flowers - ______ Red flowers - ______
Blood Types – Codominance and Multiple Alleles
4. Tell whether the following blood genotypes are homozygous (Ho) or heterozygous (He).
IAIA ____
IBi ____
ii ____
IBIB ____
IAIB ____
IAi____
5. Determine the blood type phenotype for each genotype:
IAIA ____
IBi ____
ii ____
IBIB ____
IAIB ____
IAi____
6. For each blood type phenotype, give the genotypes possible:
Type A: __________
Type B __________
Type O __________
Type AB __________
7. Sandy Cheeks met Rusty Acorns at the water chestnut festival. They fell in love. Sandy is blood type AB
& Rusty is blood type O.
Sandy’s genotype:
_______
Rusty’s genotype
_______
Complete the Punnett square to show the possible
blood genotypes of their children.
What is the possibility of a baby squirrel with blood type O?
_____ %
What is the possibility of a baby squirrel with blood type AB?
_____ %
What is the possibility of a baby squirrel with blood type A?
_____ %
What is the possibility of a baby squirrel with blood type B?
_____ %
Explain why none of the offspring are expected to have the same blood type as either parent.
8. Pearl the whale had a horrible accident at cheerleading practice and needs to find out her possible
blood type for a blood transfusion. Her dad, Mr. Krabbs is homozygous for blood type A and her mom is
heterozygous for blood type B.
Mr. Krabbs’s genotype:
_______
Mrs. Krabbs’s genotype:
_______
Complete the Punnett square to show Pearl’s possible blood type(s).
What is the possibility of Pearl having blood type O?
_____ %
What is the possibility of Pearl having blood type AB?
_____ %
What is the possibility of Pearl having blood type A?
_____ %
What is the possibility of Pearl having blood type B?
_____ %
Sex Linked Traits
9. Tell whether or not the following carry or show the sex-linked recessive krabby-blindness trait. Also tell
whether the individuals are male or female.
(Remember that since most sex-linked traits are recessive, the person who shows the trait can have no X’s
with big superscripted letters. So, if a male carries the trait, he must also show the trait.)
XKXk
XkXk
XKY
XKXK
XkY
Carrier? (Y or N)
Has Trait? (Y or N)
Male or Female? (M or F)
10. Why are there more males than females with the krabby-blindness trait?
11. How can a female inherit a sex-linked trait? Give an example to support your explanation.
12. Fathers do not pass sex-linked traits to their sons. Why not?
13. A krabby-blind whale has married Pearl who has normal vision. One of their two sons is also colorblind.
What are the genotypes of the parents? How do you know?
Before you begin the following problem, remember that you set up the problems with the mom & dad sex
chromosomes, and then give them the appropriate superscripts, depending on their genotypes.
14. In sponges, there exists a sex-linked recessive disorder that causes a sponge to have tiny pores. (XP =
normal pores, Xp = recessive small pores). SpongeBob & his true love SpongeSusie are planning to have
baby sponges. SpongeBob has the disorder & Susie is a carrier.
SpongeBob’s genotype:
_______
SpongeSusie’s genotype:
_______
X
X
Make a Punnett square to show the possible genotypes of their children.
What percentage of their sons will have the disorder?
_____ %
What percentage of their sons will be normal?
_____ %
What percentage of their daughters will have the disorder?
_____ %
What percentage of their daughters will be normal but carriers? _____ %
What percentage of their daughters will be normal non-carriers? _____ %
Y
X