Download even more 9-2 problems - Ms. Dooley`s Science Class

PUNNETT PRACTICE #2
1. In Four O’Clock plants, RED FLOWERS (R) are INCOMPLETELY dominant over
white (r) flowers. Therefore, heterozygous plants show a blended intermediate
phenotype of PINK flowers.
MAKE A CROSS WITH 2 HETEROZYGOUS FOUR O’CLOCK PLANTS.
POSSIBLE Offspring
x
__
__
Genotypes
______
______
______
__
Phenotypes
_____________________
_____________________
_____________________
__
2. If the red allele in Four-o’clocks was COMPLETELY DOMINANT over the white
allele, what would the phenotype be for a plant with a Rr genotype?
______________________
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
3. You are exploring the jungle and find a new species of plant. Some of the
plants have red flowers and some have yellow flowers. You cross a red flowering
plant with a yellow flowering plant and all the offspring have orange flowers.
You might assume that the alleles for flower color in this plant show:
A.
B.
C.
complete dominance
incomplete dominance
codominance
4. If the red and yellow alleles in the mystery jungle plant above showed
CODOMINANCE instead, what might you expect a plant with one red allele and
one yellow allele to look like?
A.
B.
C.
D.
It
It
It
It
would have all red flowers
would have all blue flowers
would have red and yellow flowers together on one plant
wouldn’t make any flowers because it is a mutant.
BLOOD TYPES:
In the ABO blood type system, A and B alleles are dominant. O alleles are recessive.
A and B are CODOMINANT to each other.
5. Make a cross between a type AO mom and a type BO dad. What are the
possible genotypes and probability (%) of each blood type of the offspring?
POSSIBLE Offspring
x
__
__
__
__
*
Genotypes
___ ___
___ ___
___ ___
___ ___
Phenotypes
blood type A =
blood type B =
blood type O =
blood type AB =
_____%
_____%
_____%
_____%
*
*
*
*
*
*
*
*
*
*
*
*
*
*
6. Make a cross between a type AO mom and a type BB dad. What are the possible
genotypes and probability (%) of each blood type of the offspring?
POSSIBLE Offspring
x
__
__
__
Genotypes
___ ___
___ ___
Phenotypes
blood type B =
_____%
blood type AB = _____%
__
*
*
*
*
*
*
*
*
*
*
*
*
*
*
7. Make a cross between a type AA mom and a type OO dad. What are the possible
genotypes and probability (%) of each blood type of the offspring?
POSSIBLE Offspring
x
__
__
__
__
Genotypes
___ ___
Phenotypes
blood type A =
_____%
Draw a picture of what the
blood cells of these offspring
would look like.
8. You are working in the Emergency room and a bleeding patient with type B
blood is brought in. You need to give him blood, but the hospital is all out of
type B. Circle ALL the types of blood you could safely give him instead.
A
AB
O
9. What if the bleeding patient had type AB blood and the hospital was out of AB
blood. Circle ALL the types of blood you could safely give him.
A
B
O
JERRY SPRINGER GENETICS
Wanda tells Jerry Springer that she thinks either Ralph or Fred could be the father of
her baby.
Wanda’s genotype is AO.
Ralph’s genotype is AB.
Fred’s genotype is BO.
Wanda’s baby has type O blood. Genotype = ___ ___
Make two crosses to show who could be the father of Wanda’s baby.
Ralph X Wanda
x
__
__
Fred X Wanda
x
__
__
__
__
__
__
Is it possible for Ralph to be the baby’s father?
YES
NO
Is it possible for Fred to be the baby’s father?
YES
NO
Does this absolutely PROVE that Fred IS the baby’s father?
YES
NO
EXPLAIN Your answer _________________________________________________
___________________________________________________________________
Wanda’s baby has type O blood, so….what are the possible genotypes for men who
COULD BE the father of Wanda’s baby?
____ ____, ____ ____, ____ ____
Just a little advice…
Don’t put yourself in a situation where you ever might need to call this number.