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WorksheetsBiology - Genetics
Total questions: 35
Worksheet time: 2hrs 53mins
Name
Class
Date
1.
Dominant alleles are represented by a:
a)
Male gene
b)
lowercase letter
c)
recessive trait
d)
capital letter
2.
Aa, DD, bB, yy are all examples of
a)
genotypes
b)
phenotypes
3.
In a heterozygous genotype, the ___________ allele takes over in the phenotype.
a)
recessive
b)
dominant
c)
lower case letter
d)
both
4.
What you see, or the physical appearance.
a)
Genotype
b)
Phenotype
c)
Homozygous
d)
Heterozygous
5.
Which of the following is a phenotype?
a)
Aa
b)
red hair
c)
heterozygous
d)
DNA
6.
What ratio of the offspring from the cross shown will be homozygous recessive for the trait of tallness?
a)
0 in 4
b)
1 in 4
c)
2 in 4
d)
4 in 4
7.
Which of the following genotypes is homozygous dominant?
a)
A
b)
Aa
c)
AA
d)
aa
8.
Which of the following genotypes is heterozygous?
a)
Bb
b)
BB
c)
bb
d)
B
9.
In a flowering plant species, red flower color (R) is dominant over white flower color (r). What is the genotype of any red-flowering plant resulting from this species?
a)
rr
b)
R
c)
RR
d)
RR or Rr
10.
Which of the characteristics is a lion least likely to pass on to its offspring?
a)
fur color
b)
length of tail
c)
scars on leg
d)
body size
11.
How many boxes would say BB?
a)
1
b)
2
c)
4
d)
0
12.
If B = brown hair and b = blonde hair, what is the probability of brown hair?
a)
25%
b)
50%
c)
0%
d)
75%
13.
bb is a _________________ genotype
a)
Dominant
b)
Homozygous
c)
Genotype
d)
Phenotype
14.
Which of the following genotypes is heterozygous?
a)
Bb
b)
BB
c)
bb
d)
B
15.
Which of the following is homozygous recessive?
a)
rr
b)
AA
c)
TT
d)
Ff
16.
Squidward has light blue skin, and his genotype for this trait is Bb. Would Squidward be considered a purebred or hybrid for light blue skin?
a)
Purebred
b)
Hybrid
17.
Where do your inherited genes come from?
a)
offspring
b)
parents
c)
gametes
d)
grandchildren
18.
An organism's _______ describes its genetic composition. An organism's _______ describes its appearance or observable characteristics.
a)
phenotype; genotype
b)
species; heredity
c)
heredity; species
d)
genotype; phenotype
19.
Having two of the same genes for the trait (TT, tt); Both dominant or both recessive.
a)
homozygous or purebred
b)
heterozygous or hybrid
c)
twin offspring
d)
pairs of chromosomes
20.
Which of the following alleles is homozygous (purebred) recessive?
a)
Tt
b)
tt
c)
TT
d)
t
21.
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%
22.
Which of the following is a phenotype?
a)
Aa
b)
red hair
c)
heterozygous genes
d)
mutated DNA
23.
In a heterozygous genotype, the ___________ allele takes over in the phenotype.
a)
recessive
b)
dominant
c)
lower case letter
d)
both
24.
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
25.
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
26.
Who is considered the "father of genetics"?
a)
Gregor Mendel
b)
Reginald Punnett
c)
James Watson
d)
Justin Bieber
27.
the passing of genetic traits from parent to offspring.
a)
heredity
b)
trait
c)
gene
d)
allele
28.
The scientific study of heredity is ____.
a)
Genetics
b)
Punnett squares
c)
Inheritance
d)
Biology
29.
If one stronger trait "covers" up another weaker trait, the trait that covers the other is said to be:
a)
Dominant
b)
Heterozygous
c)
Recessive
d)
Hidden
30.
How many alleles (letters) do each person carry for a trait?
a)
1
b)
2
c)
3
d)
4
31.
Which of the following genotypes is homozygous dominant?
a)
A
b)
Aa
c)
AA
d)
aa
32.
W=white hair
w= non-white hair
If you cross a horse with WW and a horse with ww what fraction of the offspring would be expected to have white hair?
w= non-white hair
If you cross a horse with WW and a horse with ww what fraction of the offspring would be expected to have white hair?
a)
none
b)
3/4
c)
1/2
d)
all
33.
Heterozygous is when...
a)
the alleles are the same
b)
the alleles are different
c)
the alleles are absent
d)
the alleles are present
34.
A green pea plant (Gg) is crossed with a yellow pea plant (gg). Describe the genotype of the offspring. (Be sure to remember that the capital letter is dominant).
a)
50% heterozygous and 25% homozygous recessive
b)
50% heterozygous and 50% homozygous recessive
c)
100% homozygous recessive
d)
25% heterozygous and 50% homozygous
35.
A tall plant (TT) is crossed with a tall plant (Tt). What is the phenotype of the offspring?
a)
50% homozygous dominant; 50% heterozygous; 100% tall
b)
100% homozygous dominant; 100% tall
c)
25% homozygous dominant; 75% heterozygous; 100% short
d)
50% homozygous dominant; 50% heterozygous; 100% short
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