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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 heterozygous
B
heterozygous x heterozygous
C
homozygous recessive x heterozygous
D
homozygous dominant x homozygous recessive
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 xll
C
Ll x Ll
D
LL x Ll
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
black fur
B
tan 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
AB
B
SS
C
Ss
D
ss
9) guinea pigs have two alleles for ear shape pointy(A) and round (a). two heterozygous guinea pigs are crossed
A
Aa xaa
B
Aax Aa
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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