Name: _____________________________________________ Per ...



Name: _____________________________________________ Period: __________ Date: __________________________________Codominance Worksheet: Blood TypesHuman blood types are determined by genes that follow the CODOMINANCE pattern of inheritance; this means that both alleles are expressed (just like on a team with CO-CAPTAINS both captains get to express their opinions and both get to lead). There are two dominant alleles (IA or IB) and one recessive allele (i). The alleles determine the type of antigens on the surface of cells; antigens are markers found on the surface of cells.Blood Type (Phenotype)Genotype(s)Surface Molecule(s)Can donate blood to:Can receive blood from:ABAB(universal receiver)O(universal donor)Write the genotype for each person based on the description:Homozygous for the “B” allele______Heterozygous for the “A” allele______Type O______Type “A” and had a type “O” parent______Type “AB”______Blood can be donated to anybody______Can only get blood from a type “O” donor______Pretend that SpongeBob is homozygous for the type B allele, and SpongeSusie is type “O.” What are all the possible blood types of their baby? Use a Punnett Square to support your answer.Parental Genotypes _____________ X _____________Offspring Genotypic Ratio:Offspring Phenotypic Ratio: Draw a Punnett square showing all the possible blood types for the offspring produced by a type “O” mother and a Type “AB” fatherParental Genotypes _____________ X _____________Offspring Genotypic Ratio:Offspring Phenotypic Ratio: Mrs. Squidward is type “A” and Mr. Squidward is type “O.” They have three children named Squishy, Squirt, and Emmanuel Lewis. Squishy is type “O,” Squirt is type “A,” and Emmanuel Lewis is type “AB.” They think one of their kids was switched at birth. Based on this information:Mr. Squidward can only have the genotype _________________.Mrs. Squidward must have the genotype ___________ because _________________ has blood type __________.Draw a Punnett Square for the possible offspring that Mrs. and Mr. Squidward can produce. Which child must have been switched at birth? Explain your answer. Two parents think their baby was switched at the hospital. It’s 1968, so DNA fingerprinting technology does not exist yet. The mother has blood type “O,” the father has blood type “AB,” and the baby has blood type “B.”Mother’s genotype: _______Father’s genotype: _______Genotype(s) of all kids: _______________________________________________________Punnett square showing all possible genotypes for children produced by this couple:Was the baby switched? Explain your answer.Two other parents think their baby was switched at the hospital. The mother is homozygous type “A,” the father is heterozygous type “B,” and the baby has blood type “AB.”Mother’s genotype: _______ Father’s genotype: _______ Baby genotype possibilities for this couple: ____________ or ___________Punnett square showing all the possible genotypes for children produced by this couple:Was the baby switched? Explain your answer.Cross a purebred Type A woman with a hybrid Type B man.Parental Genotypes _____________ X _____________Offspring Genotypic Ratio:Offspring Phenotypic Ratio: Lisa is a universal donor. Her father Homer has Type A blood and her mother Marge has Type B blood. What is Homer’s genotype?______________ What is Marge’s genotype? __________________Draw a Punnett Square to support your answers for the parental genotypes.What are the possible genotypes for Bart and Maggie? _______________________________Part 2: The Long Lost Son: Mr. Howell died and left all his money to his two children. A young man claiming to be a lost third child sued for his share of the estate. The judge ordered blood tests for all family members and for the young man.Mr. Howell’s blood type was already on record. He had type AB blood. His wife had type A, and the young man who claimed to be the long-lost son had type O blood. The judge quickly dismissed the case. What are the possible genotypes of the young man claiming to be Mr. Howell’s long-lost son?_________________Create a Punnett square and find the offspring that can be produced if Mrs. Howell had the genotype AA and Mr. Howell had the genotype AB.What are the possible phenotypes of the offspring? ___________________What are the phenotypic ratios? ___________________Does this outcome support or refute the judge’s decision? ___________________Create a Punnett square and find the offspring that can be produced if Mrs. Howell had the genotype A and Mr. Howell had the genotype AB.What are the possible phenotypes of the offspring? ___________________What is the p-ratio? ___________________Does this outcome support or refute the judge’s decision? ___________________Based on the Punnett squares you created, list all the possible blood types that Mr. Howell’s offspring could have:_______________________________________Do you agree or disagree with the judge’s decision? Explain your answer in at least 2 sentences.________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________ ................
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