Suppose the allele A is a dominant negative allele that causes a strong thirst f
ID: 214187 • Letter: S
Question
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.
A.Normal
B.Thirsty for blood
C.Needs more information
Explanation / Answer
Question 1: 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?
A.
Normal
B.
Thirsty for blood
C.
Needs more information
Answer: B
Dominant negative mutations or antimorphic mutations have an altered gene product that acts antagonistically to the wild-type allele. These mutations usually result in an altered molecular function (often inactive) and are characterized by a dominant or semi-dominant phenotype.
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Question 2: Which of the following term implies gene and gene interaction?
A.
Dominance
B.
Co-dominance
C.
Epistasis
D.
Complementation
Answer: C
Epistasis is defined as the interaction of genes that are not alleles, in particular the suppression of the effect of one such gene by another.
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Question 3: Which of the following terms describes the hierarchy of dominance?
A.
Dominant epistasis
B.
Allelism
C.
Allelic series
D.
Recessive epistasis
Answer :A
Dominant epistasis is when the dominant allele of one gene masks the effects of either allele of the second gene.
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Question 4: Which of the following statements correctly describes dominance and dominant epistasis?
A.
They are basically the same.
B.
They both refer to the interaction between two alleles of the same gene.
C.
They both involve two genes.
D.
Dominance refers to interaction between two alleles of the same gene, whereas dominant epistasis involves two genes.
Answer : D
Dominance: the phenomenon whereby, in an individual containing two allelic forms of a gene, one is expressed to the exclusion of the other. Dominance refers to the interaction of two alleles of the same gene. Thus it involves single locus.
Dominant epistasis: when the dominant allele of one gene masks the effects of either allele of the second gene.
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A.
Normal
B.
Thirsty for blood
C.
Needs more information
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