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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
50%
B
25%
C
0%
D
75%
2) Two heterozygous mice with brown fur have offspring. What percent will have the genotype Bb?
A
100%
B
25%
C
50%
D
75%
3) If a cross is RR x Rr, what will the percentage of the offspring will have the Rr genotype?
A
25%
B
75%
C
100%
D
50%
4) What is the genotype for a homozygous recessive individual?
A
HH
B
H
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
0%
B
100%
C
75%
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
white flowers
D
yellow 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
only rr
B
Only RR
C
RR and 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
25%
B
100%
C
50%
D
0%
11) Tt is described as...
A
heterozygous
B
homozygous recessive
C
homozygous dominant
12) bb is described as...
A
homozygous recessive
B
homozygous dominant
C
heterozygous
13) GG is described as...
A
homozygous recessive
B
homozygous dominant
C
heterozygous
14) The word phenotype refers to ...
A
23 chromosome pairs
B
An observable trait.
C
The inherited gene combination.
D
Aa
15) The word genotype refers to ...
A
23 chromosome pairs
B
A trait like blue eyes.
C
Base pairs on a strand of DNA
D
The inherited gene combination, Bb.
*select an answer for all questions
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