1.
Japanese four o'clocks show incomplete dominance. Red and white plants are
pure-breeding, but the heterozygotes are pink. Show the phenotypes and
genotypes of offspring from the following crosses:
a)
pink
x pink
b) red x white
c)
red
x pink .
d) white x
pink
2.
If the litter resulting from the mating of two short-tailed cats contains three. kittens without tails; two
with long tails, and six with short tails, what would be the simplest way of explaining the inheritance of tail length
in these cats? Show phenotypes and
their matching genotypes.
3. Show all
possible blood types of children whose parents. are:
a)
O
and O
b)
O
and A
c)
O
and AB
d)
B
and B
e)
A
and B
f)
A
and AB
g)
B
and AB
h)
AB
and AB
4. If a man with blood type
B, one of whose parents had blood type 0, marries a woman with blood
type AB, what will be the percentage
of their children with blood type B?
5. Both Mrs. Smith and Mrs. Jones had babies
the same day in the same hospital.. Mrs. Smith took home a baby girl, whom she
named Shirley. Mrs. Jones took home a baby
girl whom she named Jane. Mrs. Jones began to suspect, however, that her child
had been accidentally switched with the Smith baby in the nursery. Blood tests
were made; Mr. Smith was type A, Mrs. Smith was type B; Mr. Jones. was
type A, Mrs. Jones was type A. Shirley was type 0 and Jane was type B.
Had a mix up occurred?
6. Family X claims that baby C, given to them at the
hospital, does not belong, .to them, but to Family Y, and that baby D in the
possession of family Y is really theirs. It is alleged that the two babies,
both girls, were accidentally exchanged soon after birth. Family Y denies that
such an exchange has been made. Blood group determinations show X mother
AB, X father O, Y mother A, Y father O,
C baby A, D baby O. If you were on a jury for this case, what would you conclude?