In which one of the following combinations (a-d) of the number of chromosomes is the present day hexaploid wheat correctly represented
| Combination | Monosoic | Haploid | Nullisomic | Trisomic |
| (a) | 21 | 28 | 42 | 43 |
| (b) | 7 | 28 | 40 | 42 |
| (c) | 21 | 7 | 42 | 43 |
| (d) | 41 | 21 | 40 | 43 |
D.
| (d) | 41 | 21 | 40 | 43 |
The present day wheat is hexaploid, known as triticale (2n = 42) with 3 genomes A, B and D
i.e, AABBDD The 3 genomes are obtained from
3 different diploid species.
(i) Triticum aegilopoides -AA (2n = 14)
(ii) Aegilops speltoides - BB (2n = 14)
(iii) Aegilops squarossa - DD (2n = 14)
By crossing of first two diploids sps Triticum dicoccoides (2n = 28) i.e., tetraploid is produced AABB which on crossing with third species gives rise to Triticum aestivum (2n = 42) hexaploid (AABBDD). So its haploid set will have 21 chromosomes, monosomic (2n - I) will have 41 chromosomes, nullisomics (2n - 2) will have 40 chromosomes, and trisomic (2n + I) will have 43 chromosomes.
Which one of the following is a correct statement?
"Bt" in "Bt-cotton" indicates that it is a genetically modified organism produced through biotechnology
Somatic hybridization involves fusion of two complete plant cells carrying desired genes.
The anticoagulant hirudin is being produced from transgenic Brassica napus seeds.
"Flavr Savr" variety of tomato has enhanced the production of ethylene which improves its taste.
In the following table identify the correct matching of the crop, its disease and the corresponding pathogen.
| Crop | Disease | Pathogen |
| Citrus | Canker | Pseudomonas rubrilineans |
| Potato | Late blight | Fusarium udum |
| Brinjal | Root-knot | Meloidogyne incognita |
| Pigeon | pea Seed gall | Phytophthora infestans |
In transgenics, expression of transgene in target tissue is determined by
enhancer
transgene
promoter
reporter.
First clinical gene therapy was given in 1992 to a 4 years old girl for
adenine deficiency
growth deficiency
adenosine deaminase deficiency
adenosine deficiency
Assertion : Saccharomyces cerevisiae produces acetic acid.
Reason : Trichoderma polysporum produces blood cholestrol lowering agent.
If both assertion and reason are true and reason is the correct explanation of assertion.
If both assertion and reason are hue but reason is not the correct explanation of assertion.
If assertion is true but reason is false.
If both assertion and reason are false.
One of the major difficulties in the biological control of insect pest is that
the predator develops a preference to other diets and may itself become a pest
the predator does not always survive when transferred to a new environment
the method is less effective as compared with the use of insecticides
the practical difficulty of introducing the predator to specific areas.
Assertion: A gene from Bacillus thuringiensis is incorporated in plant genome to increase their yield.
Reason: Bacillus thuringiensis has Bt toxin producing gene, which kills the larva of insects
If both assertion and reason are true and reason is the correct explanation of assertion
If both assertion and reason are true but reason is not the correct explanation of assertion
If assertion is true but reason is false
If both assertion and reason are false.
Select the correct statement.
Acetobacter aceti produces citric acid
Saccharomyces cerevisiae is used as clot buster
Penicillium notatum restrict the growth of Staphylococci
Methanogens are found in aerobic conditions
The first bioherbicide developed in 1981 was based on
Phytophthora palmivora
Phytophthora infestans
Bacillus thuringiensis
Azadirachta indica
