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WorksheetsPunnett Square
Total questions: 20
Worksheet time: 21mins
Name
Class
Date
1.
Homozygous is when...
a)
the alleles are the same
b)
the alleles are different
c)
the alleles are absent
d)
the alleles are present
2.
Heterozygous is when...
a)
the alleles are the same
b)
the alleles are different
c)
the alleles are absent
d)
the alleles are present
3.
In a heterozygous genotype, the ___________ allele takes over in the phenotype.
a)
recessive
b)
dominant
c)
lower case letter
d)
both
4.
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
5.
B = brown fur b = white fur
In the punnett square, what is the probability for white fur?
In the punnett square, what is the probability for white fur?
a)
0%
b)
25%
c)
50%
d)
75%
6.
In the punnett square shown, what must the genotype of the missing parent be?
a)
BB
b)
Bb
c)
bb
d)
Tt
7.
What allele combination should go in the missing box?
a)
AA
b)
Aa
c)
aa
d)
none of these
8.
Each one of the boxes on the Punnett Square represents what probability of an offsprings' genotype?
a)
25%
b)
1%
c)
10%
d)
0%
9.
Which choice best represents the genotype of this cross?
a)
1 Yy: 2 yy: 0 YY
b)
2 Yy: 2 yy: 0 YY
c)
3 Yy: 1 yy: 0 YY
d)
1 Yy: 3 yy: 0 YY
10.
In pea plants, the tall allele is dominant to the short allele. What key would demonstrate this?
a)
Tall = T
Short = S
Short = S
b)
Tall = T
Short = t
Short = t
c)
Tall = t
Short = T
Short = T
d)
Tall = TT
Short = tt
Short = tt
11.
A heterozygous long-tusked elephant is crossed with a homozygous recessive short-tusked elephant. What is the probability of the offspring having short tusks?
a)
0%
b)
25%
c)
50%
d)
75%
12.
What is the probability of a purple-horned unicorn if a heterozygous pink-horned unicorn is crossed with a heterozygous pink-horned unicorn?
a)
0%
b)
25%
c)
50%
d)
75%
13.
Identify the homozygous dominant genotype:
a)
FF
b)
Ff
c)
ff
14.
Aa, DD, bB, yy are all examples of
a)
genotypes
b)
phenotypes
15.
What you see, or the physical appearance.
a)
Genotype
b)
Phenotype
c)
Homozygous
d)
Heterozygous
16.
Black fur(B) in guinea pigs is dominant over white fur(b). Find the probability of a white offspring in a cross: Bb x bb
a)
0%
b)
25%
c)
50%
d)
75%
e)
100%
17.
Black fur(B) in guinea pigs is dominant over white fur(b). Find the probability of a black offspring in a cross: bb x bb.
a)
0%
b)
25%
c)
50%
d)
75%
e)
100%
18.
Black fur(B) in guinea pigs is dominant over white fur(b). Find the probability of the genotype Bb in a cross: Bb x Bb.
a)
0%
b)
25%
c)
50%
d)
75%
e)
100%
19.
Black fur(B) in guinea pigs is dominant over white fur(b). Find the probability of the genotype BB in a cross: BB x Bb.
a)
0%
b)
25%
c)
50%
d)
75%
e)
100%
20.
Black fur(B) in guinea pigs is dominant over white fur(b). Find the probability of the genotype bb in a cross: BB x Bb.
a)
0%
b)
25%
c)
50%
d)
75%
e)
100%
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