1) Which of the following statements does NOT provide an explanation for hybrid vigor
A. Under certain circumstances, heterozygotes are superior to either possible homozygote
B. Disease-causing, homozygous recessive phenotypes from either parent are masked in the hybrids
C. Offspring from a hybrid cross usually possess the best of two desirable parents
D. Inherently, hybrids have no deleterious mutations
2) Three linked genes (A-B-C) are separated by 30 cM and 20 cM, respectively. In a population of 1000 test cross individuals, a total of 25 double recombinants were recovered. The coefficient of coincidence is
A. 0.416
B. 0.58
C. 0.06
D. 0.02
3) Coefficient of variance is more useful parameter than absolute variance because
A. It has lower value than variance
B. It is not dependent on variance
C. It is independent of units
D. It is dependent on units
4) Smaller cot ½ values indicates
A. More repetitive DNA sequences
B. Less repetitive DNA
C. Low unique DNA sequences
D. More unique DNA sequences
5) Loss of vigor and variability among inbred lines due to inbreeding are a consequence of homozygosity of
A. Desirable alleles
B. Desirable and undesirable alleles
C. Undesirable alleles
D. Mutant alleles
6) In an experiment on determining the order of gene in bacteria, HFR strain was used which is Gal⁺, Lac⁺, Ara⁺ and His⁺. If the recipient is negative for all these genes, and only Gal⁺ types were selected and the pattern - 100% recipients are Gal⁺ ; 30% are His⁺ ; 55% are Lac⁺ and only 5% were Ara⁺. Which of the following inference is correct?
A. Sequence of gene is Gal—Lac—His—Ara
B. Information is incomplete to infer about the sequences
C. The HFR is incorporated between Gal and His only
D. The recipient selectively incorporated some genes
7) Molecular markers common in two or more genetic maps of a given species are referred as
A. Anchor
B. Polymorphic
C. Dominant
D. Comparative
8) Improved PUSA Basmati has resistant gene for
A. Blast
B. Brown plant hopper
C. Bacterial blight
D. Gall midge
9) ‘t’ test is applicable when the number of treatments are
A. 6
B. 10
C. 2
D. 8
10) How many alleles are possible at a single SNP locus?
A. One
B. Two
C. Multiple
D. Four
11) Which of the following molecules is useful as a measure of relatedness beyond species
A. mRNA
B. tRNA
C. miRNA
D. rRNA
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