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Monohybrid Mendellian Genetics
Test Description: This is a game that reviews basic genetics vocabulary and simple monohybrid crosses.
Instructions: Answer all questions to get your test result.
1) An organism with a homozygous dominant genotype is represented with the letters-
A
AA and aa are both correct
B
AA
C
aa
D
Aa
2) An organism with a heterozygous genotype is represented with the letters-
A
AA
B
Aa
C
AA and aa are both correct
D
aa
3) An organism with the recessive phenotype has the genotype-
A
aa
B
AA
C
Aa
D
AA and aa are both correct
4) Another name for the physical characteristics of an organism is--
A
genotype
B
phenotype
C
trait
D
both trait and phenotype are correct
5) In plants, tall (T) is dominant to short. If a homozygous tall plant is bred with a heterozygous plant. What are the genotypes of the two plants?
A
TT x tt
B
TT x Tt
C
tt x Tt
D
TT x TT
6) In peas, round (R) is dominant to wrinkled. A heterozygous round pea is crossed with a wrinkled pea. What are the genotypes of the parents?
A
RR x Rr
B
RR x rr
C
Rr x Rr
D
Rr x rr
7) In plants, tall (T) is dominant to short. If a homozygous tall plant is bred with a heterozygous plant. What is the predicted phenotypic ratio of the offspring?
A
100% short
B
75% tall and 25% short
C
100% tall
D
50% tall and 50% short
8) In peas, round (R) is dominant to wrinkled. A heterozygous round pea is crossed with a wrinkled pea. What is the expected genotypic ratio of the parents
A
2 RR : 2 Rr : 0 rr
B
1 RR : 2 Rr : 1 rr
C
0 RR : 2 Rr : 2 rr
D
2 RR : 0 Rr : 2 rr
9) In guinea pigs, black fur (B) is dominant to white fur (b). If two heterozygous guinea pigs mate, what is the predicted genotypic ratio?
A
0 BB : 4 Bb : 0 bb
B
0 BB : 2 Bb : 2 bb
C
2 BB : 2 Bb : 0 bb
D
1 BB : 2 Bb : 1 bb
10) In guinea pigs, black fur (B) is dominant to white fur (b). If a black female guinea pig mates with a white male guinea pig and half of the offspring are black then--
A
the offspring with white fur are heterozygous
B
the black female guinea pig was homozygous dominant
C
the offspring with black fur are homozygous for their black coat color
D
the black female guinea pig was heterozygous
*select an answer for all questions
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