10. Both a husband and wife have normal vision but their son blindness is a rece

Question

10. Both a husband and wife have normal vision but their son blindness is a recessive X-linked disorder. is color blind. Color What are the likely genotypes of the boy's parents? Phenotype of the boy? 11. A purebreeding red-flowered Four-o'clock (RR) is crossed with a pure white-flowered Four-o'clock (WW). The offispring are all pink. What type o is this? What will their genotypes be? breeding 12. A black cat breeds with a tan cat and their kittens are all black-and-tan tabby (striped or mottled) cats. Set up a Punnett square that shows how this could happen. Is this incomplete dominance or co-dominance? 13. Duchene Muscular Dystrophy (DMD) is a severe form of muscular dystrophy that is caused by a recessive allele on the X chromosome. Children who inherit this disorder usually die in childhood. Suppose that a woman who is a carrier for the disease marries a man who is normal. They have a boy who has DMD. a. From which parent did the boy inherit the DMD allele? b. What are the odds that any of their next sons will have DMD? c. What are the odds that any one of their daughters be a carrier for DMD? d. Can this couple have a girl with DMD? Justify your answer using a Punnet square.

Explanation / Answer

10. Let 'C' be the dominant allele for colorblindness and 'c' be the recessive allele.

The likely genotype of the boy's father - XCY

The likely genotypes of the boy's mother - XCY / XCXc

It is already mentioned in the question that the phenotype of the boy is colorblind.

Related Questions

Navigate

• Browse (All)
• Browse 1
• Subjects

---

---

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