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WorksheetsPunnett Squares Dihybrid Crosses
Total questions: 16
Worksheet time: 13mins
Name
Class
Date
1.
B = brown eyes
b = blue eyes
What is true about these two brothers that have brown eyes?
One has genotype BB the other Bb.
b = blue eyes
What is true about these two brothers that have brown eyes?
One has genotype BB the other Bb.
a)
they have same phenotype and genotype
b)
they have different genotypes and phenotypes
c)
they have same phenotype but different genotypes
d)
they have same genotype but different phenotypes
2.
If you have a parent who has GgBb as their genotype, what are the possible alleles they could donate to their gametes?
a)
GB, Gb, gB, gb
b)
GB, GB, gb, gb
c)
Gb, Gb, Gb, GB
d)
GG, BB, gg, bb
3.
How many offspring will you have in a dihybrid cross?
a)
4
b)
8
c)
16
d)
5
4.
T4 - Black fur in mice (B) is dominant to brown fur (b). Short tails (T) are dominant to long tails (t). What percentage of the offspring of the cross BbTt x BBtt will have black fur and long tails?
a)
0%
b)
25%
c)
50%
d)
100%
5.
T4 - What genotype is missing from this Punnett Square?
a)
RrYy
b)
RRYY
c)
rryy
d)
RrYY
6.
T4 - Based off this Punnett Square, what fraction of the offspring will have wrinkled, yellow seeds?
a)
9/16
b)
3/16
c)
1/16
d)
16/16
7.
T4 - What fraction of offspring from the cross AaBB x Aabb will be heterozygous for both traits (ex. AaBb) ?
a)
1/16
b)
1/4
c)
1/2
d)
3/16
8.
Assume mom's gametes are on the left, what is her genotype?
a)
TTZz
b)
TtZz
c)
ttZZ
d)
TtZZ
9.
Assume dad's gametes are on top, what is his genotype?
a)
AAPP
b)
AaPp
c)
aaPP
d)
Aapp
10.
In watermelons, green rinds (G) are dominant to striped rinds (g). What is the genotype of a heterozygous green watermelon?
a)
GG
b)
Gg
c)
gg
d)
green
11.
In cacti, long arms (A) are dominant to short arms (a). Suppose 2 heterozygous cacti are crossed. What percentage of their offspring are expected to have short arms?
a)
0%
b)
25%
c)
75%
d)
100%
12.
Long tongues (T) are dominant to short tongues in green tree frogs. What is the probability that two frogs that are heterozygous for long tongues could produce offspring with short tongues?
a)
100%
b)
75%
c)
50%
d)
25%
13.
One of the two forms of a gene is called a(n)
a)
genotype
b)
allele
c)
hybrid
d)
trait
14.
A genotype is
a)
the listing of the alleles for the trait
b)
the physical appearance of the trait
c)
the separation of the chromosomes
d)
the letters seen on the outside of the Punnett square
15.
This is an example of a ______________.
a)
phenotype
b)
genotype
c)
xenotype
d)
base pairs
16.
The genetic make up of this flower is ________.
a)
homozygous recessive
b)
heterozygous
c)
homozygous dominant
d)
white
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