Galactosemia is a recessive human disease that istreatable by restricting lactose and glucose in the diet.Susan Smithers and her husband are both heterozygous for the galactosemia gene.a. Susan is pregnant with twins. If she hasfraternal (nonidentical) twins, what is theprobability both of the twins will be girls whohave galactosemia?b. If the twins are identical, what is the probabilitythat both will be girls and have galactosemia?For parts (c–g), assume that none of the children isa twin.c. If Susan and her husband have four children, whatis the probability that none of the four will havegalactosemia?d. If the couple has four children, what is the probability that at least one child will have galactosemia?e. If the couple has four children, what is the probability that the first two will have galactosemia andthe second two will not?f. If the couple has three children, what is the probability that two of the children will have galactosemia and one will not, regardless of order?g. If the couple has four children with galactosemia,what is the probability that their next child willhave galactosemia?
Galactosemia is a recessive human disease that is
treatable by restricting lactose and glucose in the diet.
Susan Smithers and her husband are both heterozygous for the galactosemia gene.
a. Susan is pregnant with twins. If she has
fraternal (nonidentical) twins, what is the
probability both of the twins will be girls who
have galactosemia?
b. If the twins are identical, what is the probability
that both will be girls and have galactosemia?For parts (c–g), assume that none of the children is
a twin.
c. If Susan and her husband have four children, what
is the probability that none of the four will have
galactosemia?
d. If the couple has four children, what is the probability that at least one child will have galactosemia?
e. If the couple has four children, what is the probability that the first two will have galactosemia and
the second two will not?
f. If the couple has three children, what is the probability that two of the children will have galactosemia and one will not, regardless of order?
g. If the couple has four children with galactosemia,
what is the probability that their next child will
have galactosemia?
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