1. A white flowered plant is crossed with a red flowered plant. All of the offsp
ID: 94191 • Letter: 1
Question
1. A white flowered plant is crossed with a red flowered plant. All of the offspring have pink flowers. What best explains this?
A. This is a heterozygous trait involving one dominant and one recessive allele.
B. This is a case of incomplete dominance
C. This is a case of co-dominance
D. This must be a sex-linked trait
E. This is a homozygous recessive trait
2. In guinea pigs, black fur (B) is dominant over white fur (w). You have a black guinea pig, and want to try to determine its genotype. One way to do so would be to mate your guinea pig with another guinea pig and see what the resulting offspring looked like. What genotype of breeder guinea pig would be most helpful to determine your guinea pig's genotype?
A. A homozygous dominant guinea pig (BB)
B. A heterozygous guinea pig (Bw)
C. A mutant trisomy guinea pig (BBB)
D. A homozygous recessive guinea pig (ww)
2. Match the following terms with their symbolic representation
3. One of the F1 generation (the offspring of the mating of a true-breeding purple-flowered plant and a true-breeding white flowered plant) is mated with a true-breeding white-flowered plant. What does a Punnett square predict for the F2 generation?
A. 4 Pw
B. 2 P: 2 w
C. 2 Pw: 2 ww
D. 2 PP : 2 Pw
E. 1 PP : 2 Pw : 1 ww
Explanation / Answer
1. B. This is a case of incomplete dominance as both genes are expressed, but they produce a phenotype which is a blend between the two.
2. Homozygous recessive: A. aa
Hemizygous recessive: B. XaY
Homozygous dominant: C. XAXA
Heterozygous: D. Aa
3. We have Pw X ww, resulting in 2 Pw and 2 ww. Therefore the correct answer is option c.
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