Download Name______________________________________

Name_____________________________________________________________Period____________________
Punnett Square Practice – Day 1 of Study Session
Draw the Punnett square for each question in your notebook.
1. What is the probability of a homozygous 4-eyed male and a
2-eyed female having a 2-eyed baby?
_______ x’s ________
2. What is the probability of a hybrid male and homozygous 4-eyed female having a 4eyed child?
_______ x’s ________
3. What is the probability of hybrid 2-horned male and heterozygous 2-horned female
having a 1-horned child?
_______ x’s ________
Alien Traits
4. What is the probability of a red-skinned male and a
heterozygous yellow-skinned female having a red child?
_______ x’s ________
5. What is the probability of a heterozygous blue-skinned
male and a yellow and blue skinned female having a red
child?
_______ x’s ________
Y – Yellow skin
B – Blue skin
r – red skin
E – 4 eyes
e – 2 eyes
H – 2 horns
h – 1 horns
C – clawed (sex-linked)
c – clawless (sex-linked)
6. If you cross a clawless male and hybrid clawed female what percentage of children
would possibly be clawed?
_______ x’s ________
7. What is the probability of a heterozygous blue-skinned male and purebred yellow
female having a yellow and blue child?
_______ x’s ________
8. What is the probability of a clawed male and a clawless female having a child that is
clawed?
_______ x’s ________
9. If you cross a clawed male and heterozygous female what is the probability of
having a clawless child?
_______ x’s ________
10. What is the probability of a heterozygous yellow skinned male a purebred blue
female having a child with yellow skin?
_______ x’s ________
Codominance Practice Sheet – Day 2 of Study Session
If….
1. If a polka-dotted, striped thing-a-ma-jig and a hybrid for stripes mated, what would
be the probability of having:
K – polka dots
_______ x’s ________
_____% Polka dots only
S – stripes
o - solid color
_____% stripes only
_____% solid color
_____% both polka dots and stripes
2. If a homozygous green critter and a blue and green critter mated, what would be
the probability of having:
_____% Solid Green
_____% Solid Blue
_____% Solid Pink
_____% Pink and Blue
_____% Green and Blue
_______ x’s ________
G – green in color
B – blue in color
p – pink in color
3. If a heterozygous green critter and a heterozygous blue critter mated, what would
be the probability of having:
_____% Solid Green
_____% Solid Blue
_____% Solid Pink
_____% Pink and Blue
_____% Green and Blue
_______ x’s ________
G – green in color
B – blue in color
p – pink in color
What is the probability of…..
1. A hybrid for B type blood and a homozygous B type blood person having a baby
with AB type blood?
_____%
_______ x’s ________
2. An AB type blood person and a person with O type blood having a hybrid for B type
blood?
_______ x’s ________
_____%
3. A purebred B type person and a hybrid for A type blood having an AB blood type
baby?
_____%
_______ x’s ________
4. AB and O person of having a B type baby?
_____%
_______ x’s ________
5. A homozygous A type and homozygous B type having an AB type baby?
_____%
_______ x’s ________
Modern Genetics – Day 3 of Study Session
1. Based on the Punnett square to the right, what is the probability that the offspring will have the
dominant phenotype? ___________________%
B = smile dimples
b = no smile dimples
2. Based on the Punnett square to the right, what is the probability that the
offspring will be homozygous dominant ?___________________%
BB
Bb
Bb
bb
3. If a person has A type blood, what are the possible genotype(s) for that person?
_________________________
4. Which is a single gene trait? (circle all that apply)
Height
Widow’s Peak
Skin Color
Blood Type
Skin Color
Blood Type
5. Which is a multiple gene trait? (circle all that apply)
Height
Widow’s Peak
6. If a person is homozygous for B type blood is crossed with a person who is a hybrid for A type blood,
what is the probability that they will have a child with B type blood? (You must show your work on a
Punnett Square)
__________ x ___________
____________ % of having a child with B type blood
7. If a flower is codominant for it’s petal color, (G = green; P = pink; w = white), what would be the
probability of a hybrid green flower and a hybrid pink flower of having:
__________ x ___________
____________ % of having a solid green flower
____________ % of having a solid pink flower
____________ % of having white flower
____________ % of having Pink and green flower
The DNA Connection – Protein Synthesis and Mutations –
Day 4 Study Session
I.
True or False – Circle the answer for each question.
1. Genes control the production of proteins in an organism’s cells. True or False
2. DNA’s nitrogen bases are adenine, thymine, cytosine, and guanine. True or False
3. Proteins are made in the nucleus of a cell. True or False
4. There are 3 types of RNA. True or False
5. The scientific study of heredity is called genetics. True or False
6. Cells with mutations will always make normal proteins. True or False
7. Proteins are made up of amino acids. True or False
8. All mutations are harmful. True or False
9. One group of 3-nitrogen bases (codon) codes for one amino acid. True or False
10. A gene is made up of 2 alleles - one from each parent. True or False
II.
Sequence the 6 steps below that describe how proteins are made.
_____ mRNA makes a copy of the DNA code.
_____ mRNA travels outside the nucleus into the cytoplasm and attaches to a ribosome.
_____ The proteins made travel to where they are needed.
_____ tRNA carries amino acids to the ribosome, one at a time.
_____ The ribosome releases the completed protein.
_____ DNA unzips to reveal the code for making a particular protein.
III. Use the Decoder Given to Reveal the secret message. (See next page for decoder.)
DNA Message:
AGC GGA
TAT
ACA
ATG
ATT
GGG
CTC
GGT
GGC
CTT
GCC
mRNA----------- _______________________________________________________________________________
tRNA------------- _______________________________________________________________________________________
(letter)-------------- _______________________________________________________________________________________
Pedigrees and Human Genetic Disorders
Day 5 Study Session Practice
1.
The allele for the sickle-cell trait is (circle one) recessive
2. Hemophilia is caused by a (circle one)
chromosome.
recessive
dominant
dominant
codominant
codominant allele on the X
3. If a woman is a carrier for hemophilia and she marries a man who is affected with hemophilia, what is the
probability that they will have a boy who will NOT be infected by this condition?
(Complete a Punnett Square)
4.
Answer: _____%
Joe Schmoe is heterozygous for B type blood. He knows his mom is type O blood, but is uncertain of his dad’s
blood type. What blood type(s) can his dad NOT be? Circle all that apply.
Type A
Type B
Type AB
Type O
5. Which of the following traits is controlled by multiple alleles? (Circle only one)
Straight hairline
blood type
widow’s peak
smile dimples
6. A chart that tracks which members of a family have a particular trait is called a ___________.
7. Albinism is a recessive allele disorder that is not sex-linked. If a person who is a carrier for this trait marries a
homozygous dominant person, what is the probability of them having a child with the disorder?
(Complete a Punnett Square)
Answer: _____%