3) Will both of the above crosses be useful in sexing FI chicks at hatching? 16.

Question

3) Will both of the above crosses be useful in sexing FI chicks at hatching? 16. A recessive sex-linked gene (h) prolongs the blood-clotting time, resulting in what is commonly called hemophilia. From the information in the pedigree, answer the following questions. 1) If 112 marries a normal man, what is the chance of her first child being a hemophilic boy among children? 2) Suppose her first child is actually hemophilic. What is the probability that her second child will be a hemophilic boy? If I13 marries a hemophilic man, what is the probability that her first child will be normal? 3) 4) If the mother of II was phenotypically normal, what phenotype was her father? 5) If the mother of II was hemophilic, what phenotype was her father?

Explanation / Answer

Hemophilia is a recessive X linked disorder. Lets assume that allele Xh is responsible to cause hemophilia. Then the female should have XhXhphenotype and male should have XhY phenotype. Female with XhX is known as carrier. That means she will be phenotypically normal as she has one normal x chromosome. But she will carry forward the disease gene to the next generation.

1) 1/4

2) 1/4

3) 3/8

4) XhY

5) XY.

Related Questions

Navigate

• Browse (All)
• Browse 3
• Subjects

---

---

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