Â
Possible genotypes    Â
Father type B Blood
Group           Â
BOÂ Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â
Mother type A Blood
group          Â
AOÂ Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â
b) the mother will produce two gametes: IA and
IO
Thus, 50% of the gametes will carry IA
c) 1/4
2. a) Since the man and his brother will carry 1/2 similar
genes, the probablity that the man is carrying the gene is 1/2. As
Duchenne muscular dystrophy. shows X linked recessive inheritance,
the probability that the girld child will have the diseases is 1/4.
This is because 1/2 of the X chromosome will be from father and 1/2
from mother. 1/2*1/2 =1/4
b) Yes. A sperm donor would reduce the chances.
