ABO blood groups in humans are controlled by the gene I. It has three alleles – IA IB and i. Since there are three different alleles, six different genotypes are possible. How many phenotypes can occur?
1. Three
2. One
3. Four
4. Two
Breeding of crops with high levels of minerals, vitamins, and proteins is called:
| 1. | somatic hybridization |
| 2. | biofortification |
| 3. | biomagnification |
| 4. | micropropagation |
A common biocontrol agent for the control of plant diseases is:
1. Baculovirus
2. Bacillus thuringiensis
3. Glomus
4. Trichoderma
Injury to adrenal cortex is not likely to affect the secretion of which one of the following?
1. Aldosterone
2. Both androstenedione and dehydroepiandrosterone
3. Adrenalin
4. Cortisol
Which one of the following pairs is incorrectly matched?
1. Glucagon- Beta cells(source)
2. Somatostatin- Delta cells(source)
3. Corpus luteum- Relaxin(secretion)
4. Insulin- Diabetes mellitus(disease)
Select the correct statement from the ones given below with respect to dihybrid cross:
| 1. | Tightly linked genes on the same chromosome show higher recombinations |
| 2. | Genes far apart, on the same chromosome, show very few recombinations |
| 3. | Genes loosely linked, on the same chromosome, show similar recombinations as the tightly linked ones |
| 4. | Tightly linked genes on the same chromosome show very few recombinations |
Which one of the following statement with regards to the excretion by the human kidneys is correct?
| 1. | Descending limb of Loop of Henle is impermeable to water |
| 2. | Distal convoluted tubule is incapable of reabsorbing HCO3 |
| 3. | Nearly 99 per cent of the glomerular filtrate is reabsorbed by the renal tubules |
| 4. | Ascending limb of Loop of Henle is impermeable to electrolytes |
The nerve centres which control the body temperature and the urge for eating are contained in:
1. hypothalamus
2. pons
3. cerebellum
4. thalamus
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