QUESTION 1 Which of the following is an example of semi-dominance? Mendel\'s pur

Question

QUESTION 1

Which of the following is an example of semi-dominance?

Mendel's purple and white flowers

Snapdragon flowers

ABO blood types

Labrador fur color

1 points   

QUESTION 2

In the example of snapdragon in Figure 4.1. The allele W is incompletely dominant over w, therefore, Ww has pink flowers, different from that of WW. What is the geneticexplanation for this?

Different amount of the gene product was produced in WW and Ww, respectively.

There are two genes, one gives red color and the other one gives pink color.

There are three alleles, for red, pink and white flower colors, respectively.

None of the above.

1 points   

QUESTION 3

If a pink snapdragon flower self fertilizes, what proportion of its offspring should be red?

1/4

2/4

3/4

They will all be all pink.

1 points   

QUESTION 4

In rabbit fur color determination, the himalayan allele is __________ to the wildtype allele, but is __________ to the albino allele.

Dominant...recessive

Dominant...dominant

recessive...recessive

Recessive...dominant

1 points   

QUESTION 5

When crossing two mutations to each other in the complementation test, if the offspring has wildtype, the two mutations are _____ to each other. See Figure 4.6.

alleles

not alleles

Neither of the above.

1 points   

QUESTION 6

Suppose the allele A is a dominant negative allele that causes a strong thirst for blood like vampires do.  A+ is the normal allele. For a heterozygous individual with the genotype A/A+, what should be the phenotype?

Normal

Thirsty for blood

Needs more information

1 points   

QUESTION 7

Which of the following term implies gene and gene interaction?

Dominance

Co-dominance

Epistasis

Complementation

1 points   

QUESTION 8

Which of the following terms describes the hierarchy of dominance?

Dominant epistasis

Allelism

Allelic series

Recessive epistasis

1 points   

QUESTION 9

Which of the following statements correctly describes dominance and dominant epistasis?

They are basically the same.

They both refer to the interaction between two alleles of the same gene.

They both involve two genes.

Dominance refers to interaction between two alleles of the same gene, whereas dominant epistasis involves two genes.

1 points   

QUESTION 10

Please give an example of epistasis. Specify which type it is and how it works. Be specific with your answer.

Mendel's purple and white flowers

Snapdragon flowers

ABO blood types

Labrador fur color

Explanation / Answer

1. Option B is correct
Semi dominance = One dominant allele can not completely mask the effect of the recessive allele.
Flower color in Snapdragon exhibits semi-dominance.

2. Option A is correct
In semidominant condition, one dominant allele can not synthesize sufficient amount of the gene product to confer dominant phenotype. So, the homozygous dominant and the heterozygote show different phenotypes due to different amounts of gene expression levels.

3. Option A is correct
Parental cross: Ww X Ww
Progeny: WW Ww Ww ww
RThe ratioof red progeny = 1/4

4. Option D is correct
In rabbit fur color determination, the himalayan allele is recessive to the wildtype allele, but is dominant to the albino allele.

5. Option B is correct
F1 will be WT if both the parents are non-allelic.

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