A phenotypically normal prospective couple seeks genetic counseling because the man knows that he has a translocation of a portion of his chromosome 4 that has been exchanged with a portion of his chromosome 12
Although his translocation is balanced, he and his wife want to know the probability that his sperm will be abnormal. What is your prognosis regarding his sperm? A) 1/4 will carry the two normal chromosomes, 4 and 12, 1/4 will have only the two translocation chromosomes and no normal chromosomes 4 and 12, and 1/2 will have both normal and translocated chromosomes.
B) All will carry the same translocation as the father.
C) None will carry the translocation.
D) 1/2 will be normal and the rest will have the father's translocation.
A
You might also like to view...
In gel electrophoresis, what causes the DNA fragments to migrate?
A. Gravity D. Magnetic attraction B. Vibrations E. Centrifugal force C. Electrical charge
Microspores are indicated by
a. A. b. B. c. C. d. D. e. E.
An atom that is negatively charged because it has accepted an electron is a(n):
A. isotope. B. isomer. C. ion. D. monomer.
A SNP that can be either A or T is associated with a human disease. In the Case population, there were 2000 A alleles and 1500 T alleles. In the Control population, there were 2500 A alleles and 3000 T alleles. The allelic odds ratio indicates that the presence of an A confers a ________ times greater risk for the disease than does the T allele.
A) 1.33 B) 1 C) 0.64 D) 1.6