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WorksheetsGenetics
Total questions: 15
Worksheet time: 36mins
Name
Class
Date
1.
When is a gene is homozygous?
a)
When the alleles are the same
b)
When the alleles are different
2.
Which gene is heterozygous?
a)
TT
b)
Tt
c)
rr
d)
YY
3.
How many alleles does an individual have for each trait?
a)
1
b)
2
c)
3
d)
4
4.
What type of inheritance do two alleles have if their traits blend together?
a)
Incomplete Dominance
b)
Co-Dominance
c)
Mendelian Inheritance (Complete Dominance)
d)
Homozygous Inheritance
5.
A calico cat shows both the traits for orange fur and black fur. What kind of allele expression is this?
a)
Incomplete Dominance
b)
Co dominance
c)
Independent assortment
d)
Recessive inheritance
6.
The different analogous genes are called
a)
traits
b)
pollinators
c)
alleles
d)
hybrids
7.
A breed of chicken shows codominance for feather color. One allele codes for black feathers, another codes for white feathers. The feathers of heterozygous chickens of this breed will be:
a)
all black
b)
all white
c)
all gray
d)
speckled black and white
8.
Colorblindness is more common in males than in females because the allele for colorblindness is
a)
dominant and located on the X chromosome.
b)
recessive and located on the Y chromosome.
c)
recessive and located on the X chromosome.
d)
recessive and located on the Y chromosome.
9.
What does heterozygous mean?
a)
An organism that has the same genes for a trait (TT or tt)
b)
An organism that has different genes for a trait (Tt)
c)
When neither gene is fully dominant; offspring is a mixture of both
d)
the different forms of a trait (hair color--> brown, blonde, red
10.
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
11.
having two of the same genes for the trait (sometimes called purebred).
a)
homozygous
b)
hetrozygous
c)
protein
d)
chromosome
12.
This type of inheritance pattern is a MIXTURE of both traits.
a)
incomplete dominance
b)
co-dominance
c)
complete dominance
d)
recessive pattern
13.
Snap dragon color is a incomplete dominant trait. A red flower (RR) is crossed with white flower (rr)? What color are flowers that are Rr?
a)
Red
b)
Red and White
c)
White
d)
Pink
14.
Which of the following is a hybrid?
a)
BB
b)
bb
c)
Bb
15.
Which of the following is purebred?
a)
AA
b)
aa
c)
Aa
d)
Both AA and aa
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