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WorksheetsComplete Dominance Monohybrid Crosses
Total questions: 15
Worksheet time: 24mins
Name
Class
Date
1.
Which of the following traits of a dog is inherited from its parents?
a)
the presence of fleas in its fur
b)
the color of its fur
c)
the ability to sit up and beg
d)
the habit of barking to go outside
2.
The physical expression of a genetic trait is called a
a)
mutation
b)
genotype
c)
crossing over
d)
phenotype
3.
The following items are examples of __________.
Items: eye color, hair color, height
a)
homozygous alleles
b)
genotype
c)
heterozygous alleles
d)
phenotype
4.
having two of the same genes for the trait (sometimes called purebred).
a)
homozygous
b)
hetrozygous
c)
protein
d)
chromosome
5.
having two different genes for a trait (sometimes called hybrid).
a)
protein
b)
homozygous
c)
heterozygous
d)
genotype
6.
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
7.
Which of the following genotypes would be considered heterozygous?
a)
BB
b)
gg
c)
Ff
d)
TT
8.
Which of the following alleles is homozygous recessive?
a)
Tt
b)
tt
c)
TT
d)
T
9.
An allele whose trait always shows up in the organism when the allele is present.
a)
recessive allele
b)
dominant allele
c)
hidden allele
d)
present allele
10.
Who is the father of genetics?
a)
Charles Darwin
b)
Gregor Mendel
c)
Dimitri Mendeleev
d)
Hans Krebs
11.
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
12.
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
13.
Two brown eyed parents (Bb) have a baby. What is the chance the baby is blue eyed? (B=brown eyes and b=blue eyes)
a)
0 %
b)
25%
c)
50%
d)
75%
14.
Objective #5
(B-brown eyes & b-blue eyes)
Cross (Dad)Bb X (Mom)BB.
List the possible genotypes from this cross.
a)
BB, Bb, bb
b)
BB
c)
BB, Bb
d)
bb,Bb
15.
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
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