Questions A person that is homozygous recessive for unlobed earlobes has babies

Question

Questions A person that is homozygous recessive for unlobed earlobes has babies with a person that is homozygous dominant for lobed earlobes. What is the predicted genotype and phenotype for their offspring? (1 point) 1. genotypic ratio:_ phenotypic ratio: A woman with a blood type AB gives birth to a baby with a blood type A. Can the father have a blood type of O? Explain why or why not. (Hint: Determine the genotypic and phenotypic ratios before trying to answer the question.) (1 point) 2. Father Mother

Explanation / Answer

1) Cross between homozygous recessive unlobed earlobes and homozygous dominant lobed earlobes generates

2) If mother has blood type AB and the child has A then father may have blood type - A, B, AB or O. So father can have O blood type. O blood type means the presence of H-antigen on RBC, so when crossed with blood type AB-

Genotypic ratio and Phenotypic ratio - 1:1

3) If the mother has blood type A and child has blood type O then the blood type of father can be either A or O. Therefore, the person with blood type AB cannot be the father of the child.

4) The woman will be the carrier as her father had color blindness, her genotype - XCXc. She marries a man with normal vision then his genotype XCY

Genotypic ratio - 25%XCXC : 25% XCY : 25% XCXc : 25% XcY

Phenotypic ratio- 25% normal female : 25% normal male : 25% carrier female : 25% Color blind male

i i iA iAi iAi iB iBi iBi

Related Questions

Navigate

• Browse (All)
• Browse Q
• Subjects

---

---

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.