Choose the incorrect statement
A) Expression of a gene in all the individuals that carry it is known as complete penetrance
B) When a specific gene does not manifest its effect in all the individuals that carry this gene, it is known as incomplete penetrance
C) Differential or variable expression of a gene in the individuals that carry it is known as variable expressivity
D) Similar or uniform expression of a gene in all the individuals that carry such genes is called as complete penetrance
Characters whose development depends upon a specific environment are called as
A) Quasi-quantitative characters
B) Threshold characters
C) Qualitative characters
D) None of these
Some genes that do not have any effect of their own on a given trait but increase or decrease the expression of oligogenes governing the trait, such genes are known as
A) Minor gene
B) Modifying genes
C) Major gene
D) Oligogenes
Choose the correct statement
A) The term genetic background is often used as a synonym for modifying genes
B) The knowledge of threshold may be helpful in the identification of desirable genotypes from a population
C) Genes, which modify the effect of other genes but do not seem to have any effect of their own on the concerned traits, are called modifying genes
D) All of these
Choose the correct statement
A) Mutant gene in barley (Hordeum vulgare) produces albino seedlings at temperatures below 8°C but at 19°C becomes normal green seedlings; this is an example of threshold characters
B) These genes show various relationships with each other in producing the concerned characters; these relationships are called as interaction
C) 'S' alleles in self-incompatibility and opaque2 (O2) gene of maize are examples of modifying genes
D) All of these
The tendency of two or more genes to remain together in the same chromosome during inheritance is known as
A) Linkage
B) Penetrance
C) Pleiotropy
D) Modifying genes
The type of linkage where only parental character combinations are recovered in F₁ or test cross progeny is known as
A) Incomplete linkage
B) Complete linkage
C) Both (i) and (ii)
D) None of these
The type of linkage where recombinant types of individuals are observed in test cross progeny is known as
A) Incomplete linkage
B) Complete linkage
C) Both (i) and (ii)
D) None of these
The type of linkage where dominant alleles of the linked genes are present in the same chromosome is known as
A) Coupling phase
B) Repulsion phase
C) Both (i) and (ii)
D) None of these
The type of linkage where dominant alleles of some genes are present with recessive alleles of other genes in the same chromosome is known as
A) Coupling phase
B) Repulsion phase
C) Both (i) and (ii)
D) None of these

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