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WorksheetsGenetics
Total questions: 41
Worksheet time: 51mins
Name
Class
Date
1.
This cross between flower colors demonstrates complete dominance. If red is dominant and white is recessive, what is the phenotypic ratio of red to white flowers?
a)
3:1
b)
1:2:1
c)
2:2
d)
0:4
2.
In pea plants, height is a completely dominant trait. Tall (T) is dominant to short pea plants (t). If a heterozygous tall pea is crossed w/ a short pea, what are the genotypes of the offspring?
a)
75%Tt, 25%tt
b)
100% Tt
c)
50% Tt, 50% tt
d)
25%TT, 50%Tt, 25%tt
3.
This test cross is an example of what type of dominance?
a)
Incomplete Dominance
b)
Complete Dominance
c)
Codominance
d)
Recessiveness
4.
Hh x hh: How many different genotypes are possible for their offspring?
a)
1
b)
2
c)
3
d)
4
5.
Codominance means that both forms of a trait are...
a)
expressed equally
b)
dominant
c)
recessive
d)
blended together
6.
The term for heterozygous organisms that display two phenotypes at the same time..?
a)
Co-dominance
b)
multiple alleles
c)
incomplete dominance
d)
gene linkage
7.
Colorblindness is an X-linked recessive disorder. A female with the genotype XBXb is crossed with a male who's genotype is XbY: What is the probability that they will have a child who is color blind?
a)
50%
b)
25%
c)
75%
d)
0%
8.
Colorblindness is an X-linked recessive disorder. A female with the genotype XBXb is crossed with a male who's genotype is XbY: What is the probability that they will have a son who is color blind?
a)
50%
b)
25%
c)
0%
d)
100%
9.
What does heterozygous mean?
a)
An organism that has the same alleles for a trait (TT or tt)
b)
An organism that has different alleles for a trait (Tt)
c)
When neither allele is fully dominant; mixture of parents
d)
the different forms of a trait (hair color→brown, blonde)
10.
The inherited combination of alleles is known as the offspring's
a)
heredity
b)
genotype
c)
phenotype
d)
pedigree
11.
An organism's physical appearance or trait is known as its
a)
phenotype
b)
genotype
c)
pedigree
d)
inheritance
12.
How do we know that color blindness is a sex-linked trait?
a)
Only males can have color blindness
b)
The allele causing color blindness is on the Y chromosome
c)
Only females can have color blindness
d)
The allele causing color blindness is on the X chromosome
13.
A squirrel with black fur & a squirrel with white fur give rise to this offspring. What type of dominance is this?
a)
codominance
b)
incomplete dominance
c)
complete dominance
d)
sex-linked traits
14.
How many people are affected by a particular trait in this family?
a)
6
b)
10
c)
8
d)
7
15.
How is Person 1 Generation 1, related to Person 5, Generation 2?
a)
Father/Daughter
b)
Grandpa/Grandaughter
c)
Grandma/Grandaughter
d)
Mother/Son
16.
Left-handedness is an autosomal recessive trait. What is the genotype of Person 2, Generation 1? Use the letter H to answer this question.
a)
hh
b)
Hh
c)
HH
d)
XhXh
17.
Left-handedness is an autosomal recessive trait. What is the genotype of Person 3, Generation 3? Use the letter H to answer this question.
a)
hh
b)
Hh
c)
HH
d)
XHY
18.
Left-handedness is an autosomal recessive trait. What is the genotype of Person 1, Generation 2? Use the letter H to answer this question.
a)
hh
b)
Hh
c)
HH
d)
XHY
19.
Myopia (nearsightedness) is an X-linked recessive disorder. What is the genotype of Person 3 Generation 2?
a)
XnY
b)
XNY
c)
XnYn
d)
XnXn
20.
Myopia (nearsightedness) is an X-linked recessive disorder. What is the genotype of Person 1 Generation 1?
a)
XNY
b)
XNYN
c)
NN
d)
Nn
21.
Myopia (nearsightedness) is an X-linked recessive disorder. What is the genotype of Person 2 Generation 1?
a)
XNXn
b)
XNXN
c)
XnXn
d)
Nn
22.
In generation II, what would the genotypes of 1 & 2 have to be if this were an autosomal trait?
a)
Nn, Nn
b)
XNXN, XnY
c)
XnXn, XnY
d)
nn, nn
23.
If brown eyes are dominant over blue eyes, what percentage of offspring could have blue eyes?
a)
0%
b)
25%
c)
50%
d)
75%
24.
What is the phenotypic ratio of brown eyes to blue eyes?
a)
3:1
b)
1:3
c)
4:0
d)
2:2
25.
What is the genotypic ratio of homozygous dominant : heterozygous : homozygous recessive?
a)
1:2:1
b)
1:1:2
c)
2:1:1
d)
3:1
26.
What is ALWAYS the phenotypic ratio of a dihybrid cross, where both parents are heterozygous for both traits?
a)
9:3:3:1
b)
16:0:0:0
c)
4:4:4:4
d)
8:0:8:0
27.
In the Punnett Square, what percentage of the offspring will be heterozygous?
a)
25%
b)
50%
c)
75%
d)
100%
28.
How would you describe the father's genotype?
a)
heterozygous
b)
homozygous dominant
c)
homozygous recessive
29.
What type of dominance is this, if mother rabbit had black fur and father rabbit had white fur?
a)
Codominance
b)
Complete Dominance
c)
Incomplete Dominance
d)
Sex-Linked Inheritance
30.
1 pair of human chromosomes is the sex chromosomes. The other 22 pairs are classified as what?
a)
chromatids
b)
dominant chromosomes
c)
autosomes
d)
recessive chromosomes
31.
What would be the genotype of a female CARRIER in a SEX-LINKED GENE?
a)
XTXT
b)
XTXt
c)
Tt
d)
XtXt
32.
What would this flower's genotype be if it displays codominance? (RR=red, WW=white)
a)
RrWw
b)
RW
c)
RR
d)
WW
33.
(R) round seeds are dominant to (r) wrinkled seeds and (T) tall plants are dominant to short plants. If you crossed a recessive parent (rrtt) with a heterozygous parent (RrTt), how many of the offspring would be round and tall?
a)
3
b)
4
c)
8
d)
9
34.
(R) round seeds are dominant to (r) wrinkled seeds and (T) tall plants are dominant to dwarf plants. If you crossed a recessive parent (rrtt) with a heterozygous parent (RrTt), how many of the offspring would be wrinked and tall?
a)
1/4
b)
1/2
c)
3/4
d)
5/16
35.
An offspring will receive how many alleles from each parent to determine a specific trait?
a)
one
b)
two
c)
three
d)
five
36.
Which of the following is a phenotype?
a)
BB
b)
Bb
c)
bb
d)
Blue eyes
37.
Having two of the same genes for a trait
a)
homozygous
b)
heterozygous
c)
recessive
d)
codominant
38.
G = green, g = yellow.
The genotype for a yellow plant is...
The genotype for a yellow plant is...
a)
GG
b)
Gg
c)
gg
d)
all of the choices result in yellow
39.
An allele whose trait only shows up when no dominant allele is present is called...
a)
hidden allele
b)
dominant allele
c)
recessive allele
d)
present allele
40.
A homozygous dominant dog with brown fur, is crossed with a heterozygous dog with brown fur.
What are the percentages of the possible genotypes?
What are the percentages of the possible genotypes?
a)
100% BB
b)
75% BB and 25%Bb
c)
50 % BB and 50% Bb
d)
50% Bb and 50% bb
41.
Having two different alleles for a trait
a)
dominant
b)
homozygous
c)
heterozygous
d)
recessive
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