In Africa, orobanche is the serious pest of:
A) Sorghum
B) Sugarcane
C) Chick pea
D) All of the above
In Turkey, the serious pest of sugarbeet is:
A) Orobanche
B) Striga
C) Cuscuta
D) None of the above
In Turkey, cuscuta is the serious parasitic weed of:
A) Cotton
B) Sorghum
C) Sugarbeet
D) Sugarcane
Two heterozygous testers are used in:
A) Simple recurrent selection
B) Recurrent selection for gca
C) Recurrent selection for sca
D) Reciprocal recurrent selection
In plant breeding, undesirable linkages can be broken by:
A) Recurrent selection
B) Disruptive mating
C) Diallel selective mating
D) All of the above
Disruptive selection is a form of:
A) Pureline selection
B) Mass selection
C) Recurrent selection
D) Clonal selection
In plant breeding populations, disruptive selection is effective in:
A) Breaking undesirable linkages
B) Generating diversity
C) Improving adaptation
D) All of the above
In crop plants, clonal selection is used in:
A) Non-flowering species
B) Low seed setting species
C) Apomictic species
D) All of the above
Synthetic variety is a mixture of:
A) All possible crosses among inbreds of good gca
B) Several pure lines
C) Several open pollinated genotypes
D) Several inbred lines
Initially a synthetic variety consists of several:
A) Heterozygotes
B) Homozygotes
C) Homo and heterozygous tester
D) Purelines
In the later generations, a synthetic variety consists of several:
A) Homo and heterozygotes
B) Homozygotes
C) Heterozygotes
D) Inbred lines
The yield of a synthetic variety is always higher than:
A) Open pollinated variety
B) Single cross hybrid
C) Three way cross hybrid
D) Double cross hybrid
A synthetic variety requires reconstitution after:
A) Three years
B) Five years
C) Seven years
D) Ten years
Transmission of genes governing various characters from parents to offspring is called as
A) Polygenic inheritance
B) Oligogenic inheritance
C) Inheritance
D) Both (i) and (ii)
The mode of inheritance of qualitative character is called as
A) Polygenic inheritance
B) Oligogenic inheritance
C) Inheritance
D) Both (i) and (ii)
The mode of inheritance of quantitative character is called as
A) Polygenic inheritance
B) Oligogenic inheritance
C) Inheritance
D) Both (i) and (ii)
Choose the incorrect statement
A) Mendel proposed the law of inheritance based on qualitative characters
B) Inheritance pattern of both qualitative and quantitative characters follows Mendel's laws of inheritance but differ in both magnitude and mode of action
C) Number of genes involved in the control of quantitative traits can be estimated by two methods: Castle-Wright segregation index and inbred-backcross and genotype assay method
D) All of these
The allele that expresses itself (i.e., produces the character governed by it) in the heterozygous state is known as dominant, while the allele that is unable to do so is called recessive; this phenomenon is known as
A) Segregation
B) Dominance
C) Uniform expressivity
C) Variable expressivity
When the heterozygote is comparable to one of the homozygotes, it is called as
A) Partial or incomplete dominance
B) Co-dominance
c) Complete dominance
D) Over-dominance
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