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Punnett Square Practice
Test Description: Mendelian genetics practice
Instructions: Answer all questions to get your test result.
1) Two heterozygous mice with brown fur have offspring. What percent will have brown fur?
A
25%
B
0%
C
75%
D
50%
2) Two heterozygous mice with brown fur have offspring. What percent will have the genotype Bb?
A
25%
B
50%
C
100%
D
75%
3) If a cross is RR x Rr, what will the percentage of the offspring will have the Rr genotype?
A
50%
B
75%
C
100%
D
25%
4) What is the genotype for a homozygous recessive individual?
A
H
B
HH
C
hh
D
Hh
5) What is the genotype for a heterozygous individual?
A
G
B
GG
C
gg
D
Gg
6) If a robin is heterozygous for white head feathers has offspring with a homozygous red-head robin. What percentage of the offspring will have the red-head feather allele?
A
75%
B
100%
C
0%
D
50%
7) If the Y allele causes yellow color in daisies and y is white, what is the phenotype of homozygous recessive inheritance?
A
Yy
B
yy
C
yellow flowers
D
white flowers
8) If curly hair is dominant to straight hair which parents would have 25% chance of having a child with straight hair?
A
Hh x Hh
B
Hh x HH
C
Hh x HH
D
HH x HH
9) If red wings is dominant in butterflies, what is the possible genotype combination that will cause the trait?
A
RR and Rr
B
only rr
C
Only RR
D
RR and rr
10) Two parents are Bb for a trait. If the first child has the bb allele combination what is chance the next child will have the bb allele combination?
A
50%
B
100%
C
0%
D
25%
11) Tt is described as...
A
homozygous recessive
B
homozygous dominant
C
heterozygous
12) bb is described as...
A
homozygous dominant
B
homozygous recessive
C
heterozygous
13) GG is described as...
A
heterozygous
B
homozygous recessive
C
homozygous dominant
14) The word phenotype refers to ...
A
An observable trait.
B
Aa
C
23 chromosome pairs
D
The inherited gene combination.
15) The word genotype refers to ...
A
A trait like blue eyes.
B
23 chromosome pairs
C
Base pairs on a strand of DNA
D
The inherited gene combination, Bb.
*select an answer for all questions
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