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WorksheetsMonohybrid & Dihybrid Cross
Total questions: 20
Worksheet time: 25mins
Name
Class
Date
1.
When a person has two different alleles for a gene, they are said to be
a)
heterozygous
b)
homozygous
2.
A __________ allele always shows up in an organism when the it is present.
a)
dominant
b)
hybrid
3.
Aa, DD, bB, yy are all examples of
a)
genotypes
b)
phenotypes
4.
In a dihybrid cross
a)
one trait is crossed.
b)
two traits are crossed.
c)
four boxes are needed for the punnett square.
d)
mom's alleles are dominant.
5.
Which of the following genotypes is heterozygous?
a)
Bb
b)
BB
c)
bb
d)
B
6.
Mendel's early work with pea plants demonstrated a significant genetic discovery. The crossing of homozygous tall pea plants with homozygous short pea plants always resulted in tall plants and demonstrated that tallness in pea plants is a trait that is —
a)
blended
b)
dominant
c)
mutated
d)
recessive
7.
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
8.
What allele combination should go in the missing box?
a)
AA
b)
Aa
c)
aa
d)
none of these
9.
Dominant alleles are represented by a:
a)
Male gene
b)
Lowercase letter
c)
Recessive trait
d)
Capital letter
10.
What is the dominant trait?
a)
yellow pea seeds
b)
green pea seeds
c)
there is no dominant seed
d)
Jolly green giant
11.
This image shows a...
a)
Punnett Square
b)
Phenotype
c)
Genotype
d)
Dominant allele
12.
A characteristic that an organism can pass on to its offspring through its genes is ___________
a)
Trait
b)
Gene
c)
Allele
d)
Dominant
13.
An organism’s genetic makeup or allele combination.
a)
Genotype
b)
Phenotype
c)
Beanotype
d)
Notype
14.
An organism’s physical appearance, or visible traits.
a)
Genotype
b)
Phenotype
c)
Beanotype
d)
Notype
15.
What is called when a organism has two identical alleles for a trait. TT or tt. RR or rr
a)
Heterozygous
b)
Homozygous
c)
Domozygous
d)
Thermozygous
16.
What is called when a organism has two different alleles for a trait. Tt or Rr
a)
Heterozygous
b)
Homozygous
c)
Domozygous
d)
Thermozygous
17.
Scientists use capital and small letters to show the _____ of an organism.
a)
genotype
b)
genetic disorder
c)
phenotype
d)
genome
18.
An organism that has one dominant and one recessive allele for height is _____.
a)
unusual
b)
homozygous
c)
mutated
d)
heterozygous
19.
In a certain species of plant, the color purple (P) is dominant to the color white (p).
According to the Punnett Square, what is the probability of an offspring being purple?
According to the Punnett Square, what is the probability of an offspring being purple?
a)
25%
b)
0%
c)
100%
d)
50%
20.
In a certain species of plant, the color purple (P) is dominant to the color white (p).
According to the Punnett Square, what is the probability of an offspring being white?
According to the Punnett Square, what is the probability of an offspring being white?
a)
25%
b)
0%
c)
100%
d)
50%
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