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Genetic Crosses
Test Description: Identifying genotypes from word problems
Instructions: Answer all questions to get your test result.
1) aa x Aa
A
homozygous dominant x homozygous recessive
B
homozygous recessive x heterozygous
C
homozygous dominant x heterozygous
D
heterozygous x heterozygous
2) homozygous dominant x homozygous recessive
A
AA x aa
B
aa x aa
C
AA x Aa
D
Aa x Aa
3) recessive x heterozygous
A
AA x AA
B
aa x Aa
C
Aa x Aa
D
aa x aa
4) A plant species has two alleles for flower color: Red (R) and White (r). A heterozygous Red flower is crossed with a white flower
A
RR xRR
B
rr x rr
C
Rr x rr
D
RR x rr
5) an insect species have two alleles for leg length: Long (L) and short (l). a homozygous dominant insect is crossed with a heterozygous insect
A
LL x Ll
B
Ll x Ll
C
LL x LL
D
ll xll
6) plant species has two alleles for leaf shape: Curly (A) and flat (a). Two flat leaf shaped plants are crossed
A
AA x AA
B
Aa x Aa
C
Aa x AA
D
aa x aa
7) A population of dogs has two alleles for fur color: black (B) and tan (b). If the black allele exhibits complete dominance, what phenotype would a dog that was homozygous recessive at that locus have?
A
tan fur
B
black fur
C
no fur
D
brown fur
8) The stem length in a population of plants is controlled by two alleles: short (S) and long (s). If the phenotype of a plant is long stem, what is its genotype?
A
Ss
B
ss
C
SS
D
AB
9) guinea pigs have two alleles for ear shape pointy(A) and round (a). two heterozygous guinea pigs are crossed
A
Aax Aa
B
Aa xaa
C
AA x aa
D
aax aa
10) homozygous dominant x heterozygous
A
DD x DD
B
Dd x dd
C
dd x dd
D
DD x Dd
*select an answer for all questions
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