WorksheetsGenetics - monohybrid
Total questions: 26
Worksheet time: 22mins
Name
Class
Date
1.
Aa is an example of
a)
homozygous dominant
b)
homozygous recessive
c)
heterozygous
d)
none of these
2.
bb is an example of
a)
homozygous dominant
b)
homozygous recessive
c)
heterozygous
d)
none of these
3.
Recessive alleles are written using
a)
capital
b)
lowercase
c)
both
d)
neither
4.
AA is an example of
a)
homozygous dominant
b)
homozygous recessive
c)
heterozygous
d)
none of these
5.
Which of the following is a genotype?
a)
long hair
b)
blue eyes
c)
Gg
d)
tall
6.
Dominant alleles are written using
a)
capital
b)
lowercase
c)
both
d)
neither
7.
Which of the following is a phenotype?
a)
AA
b)
AB
c)
black fur
d)
Tt
8.
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
9.
Green is dominant to yellow. Two heterozygous green plants are crossed. What are the genotypes of the offspring?
a)
100% Gg
b)
50% GG, 50% Gg
c)
25% GG, 50% Gg, 25% gg
d)
75% Gg, 25% gg
10.
Purple is dominant to white. A heterozygous purple flower is crossed with a white flower. What are the genotypes and phenotypes of the offspring?
a)
100% Pp (purple)
b)
50% Pp (purple); 50% pp (white)
c)
75% Pp (purple); 25% pp (white)
d)
25% PP, 50% Pp, 25% pp
75% purple, 25% white
75% purple, 25% white
11.
An organism with two different alleles for a trait is said to be:
a)
recessive
b)
hybrid
c)
dominant
d)
purebred
12.
Who is the father of genetics?
a)
Charles Darwin
b)
Gregor Mendel
c)
Dimitri Mendeleev
d)
Hans Krebs
13.
An allele whose trait only shows up when no dominant allele is present.
a)
hidden allele
b)
dominant allele
c)
recessive allele
d)
present allele
14.
Different forms of genes:
a)
alleles
b)
phenotype
c)
genotype
d)
homologous chromosomes
15.
What is another way of saying "purebred"?
a)
homozygous
b)
dominant
c)
recessive
d)
heterozygous
16.
An organism's genetic make-up:
a)
phenotype
b)
genotype
c)
dominant
d)
recessive
17.
When is a recessive allele expressed in offspring?
a)
when two copies are present
b)
when parents have no dominant alleles
c)
when the offspring is heterozygous
d)
when one copy is present
18.
Recessive alleles may not be expressed because they are
a)
masked by a dominant allele
b)
the least common allele in a population.
c)
the most common allele in a population.
d)
less likely to have crossing over.
19.
If a pea plant were homozygous recessive for height, how would its alleles be represented?
a)
TT
b)
Tt
c)
tt
d)
tT
20.
Two brown eyed parents (Bb) have a baby. What is the chance the baby is blue eyed?
a)
0 %
b)
25%
c)
50%
d)
75%
21.
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
22.
T = tall an t = short
TT and Tt would result in the following phenotype
TT and Tt would result in the following phenotype
a)
short
b)
tall
c)
medium sized
d)
neither tall or short
23.
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
24.
What is the genotype ratio for crossing a heterozygous red flower with a white flower?
a)
0:2:2
b)
2:2:0
c)
1:2:1
d)
0:0:4
25.
In a test cross, an organism with an unknown genotype is crossed with
a)
homozygous dominant
b)
heterozygous
c)
homozygous dominant or heterozygous
d)
homozygous recessive
26.
When crossing a heterozygous red flower with a white flower, which trait is dominant?
a)
Red
b)
White
c)
Red and White
d)
Pink
100 %
