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WorksheetsPunnet Squares
Total questions: 19
Worksheet time: 57mins
Name
Class
Date
1.
How many alleles (letters) do each person carry for a trait?
a)
1
b)
2
c)
3
d)
4
2.
Aa, DD, bB, yy are all examples of
a)
genotypes
b)
phenotypes
3.
T - tall and t = short
In the punnett square below, what belongs in the missing square
In the punnett square below, what belongs in the missing square
a)
tt
b)
Tt
c)
Bb
d)
TT
4.
What is a punnett square?
a)
graph used to predict the possible genotypes of offspring in a given cross
b)
a graph used to predict the possible birth rate of offspring.
c)
a graph used to predict the possible behavioral characteristics an offspring could have
d)
None of the above
5.
Each one of the boxes on the Punnett Square represents what probability of an offsprings' genotype?
a)
25%
b)
1%
c)
10%
d)
0%
6.
What are the possible phenotype(s) of the offspring? (A-Brown hair; a-blond hair)
a)
50 % Brown Hair and 50% Blond Hair
b)
25 % Brown Hair and 75% Blond Hair
c)
75 % Brown Hair and 25% Blond Hair
d)
0% Brown Hair and 100% Blond Hair
7.
What are the possible genotypes for this cross?
a)
TT = 25% Tt= 50% tt=25%
b)
all tall
c)
TT= 75% tt = 25%
d)
Tt = 100%
8.
Which of the following is a phenotype?
a)
Aa
b)
red hair
c)
heterozygous
d)
DNA
9.
How many boxes would say BB?
a)
1
b)
2
c)
4
d)
0
10.
If B = brown hair and b = blonde hair, what is the probability of brown hair?
a)
25%
b)
50%
c)
0%
d)
75%
11.
Tall is dominant to short. A homozygous tall plant is crossed with a short plant. What will be the phenotypes of the offspring?
a)
100% tall
b)
50% tall, 50% short
c)
75% tall, 25% short
d)
25% tall, 75% short
12.
Bob the abominable snowman lives in the snowy Andes mountains. He has white fur, which blends in nicely. He is therefore dismayed when his mate keeps having red-furred babies. What is Bob's likely genotype?
a)
Homozygous Dominant
b)
Heterozygous
c)
Homozygous Recessive
d)
He doesn't have a genotype
13.
Leonardo bet his friend Oliver that two heterozygous green-eyed sea monsters could not have a recessive blue-eyed baby sea monster. Oliver said they can have a blue-eyed sea monster.
Who wins the bet? (G- green, g-blue)
Who wins the bet? (G- green, g-blue)
a)
Leonardo
b)
Oliver
c)
Both
d)
Neither
14.
Father of genetics; 1st person to use probability to explain heredity.
a)
Mendeleev
b)
Mendel
c)
Darwin
d)
Currie
15.
What percent of offspring show the recessive trait?
a)
25
b)
50
c)
75
d)
100
16.
To express the recessive trait you must be
a)
homozygous dominant
b)
heterozygous
c)
alleleerific
d)
homozygous recessive
17.
Mom- brown hair (Bb) Dad - brown hair (Bb)
Brown=B (dominant)
Red = b (recessive)
What is the possibility that their child will have RED hair?
Brown=B (dominant)
Red = b (recessive)
What is the possibility that their child will have RED hair?
a)
0%
b)
25%
c)
50%
d)
75%
18.
Mom- no cancer (Bb) Dad - has cancer (bb)
No cancer=B(dominant)
Cancer = b (recessive)
What is the possibility that their child will HAVE cancer?
No cancer=B(dominant)
Cancer = b (recessive)
What is the possibility that their child will HAVE cancer?
a)
0%
b)
25%
c)
50%
d)
75%
19.
Mom- intelligent (Tt) Dad - unintelligent (tt)
Intelligent = T (dominant)
unintelligent = t (recessive)
What is the possibility that their child will be intelligent?
Intelligent = T (dominant)
unintelligent = t (recessive)
What is the possibility that their child will be intelligent?
a)
0%
b)
25%
c)
50%
d)
75%
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