Q. No.Which one of the following symbols and its representation, used in human pedigree analysis is correct?
Which one of the following cannot be explained on the basis of Mendel’s Law of Dominance
1. Out of one pair of factors one is dominant and the other recessive
2. Alleles do not show any blending and both the characters recover as such in F2 generation
3. Factors occur in pairs
4. The discrete unit controlling a particular character is called a factor
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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. One
2. Four
3. Two
4. Three
Which one of the following conditions correctly describe the manner of determining the sex in the given example?
| 1. | Homozygous sex chromosomes (ZZ) determine the female sex in birds. |
| 2. | XO type of sex chromosomes determine male sex in grasshopper |
| 3. | XO condition in humans as found in Turner Syndrome, determines female sex. |
| 4. | Homozygous sex chromosomes (XX) produce males in Drosophila. |
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A person with unknown blood group under ABO system, has suffered much blood loss in an accident and needs immediate blood transfusion. His one friend who has a valid certificate of his own blood type offers blood donation without delay. What would have been the type of blood group of the donor friend?
1. Type B
2. Type AB
3. Type O
4. Type A
A certain road accident patient with unknown blood group needs immediate blood transfusion. His one doctor friend at once offers his blood. What was the blood group of the donor?
1. Blood group B
2. Blood group AB
3. Blood group O
4. Blood group A
A normal-visioned man whose father was colour-blind, marries a woman whose father was also colour-
blind. They have their first child as a daughter. What are the chance that this child would be colour–blind?
| 1. | 100% | 2. | zero percent |
| 3. | 25% | 4. | 50% |
Represented below is the inheritance pattern of a certain type of traits in humans. Which one of the following conditions could be an example of this pattern?
| 1. | Phenylketonuria | 2. | Sickle cell anaemia |
| 3. | Haemophilia | 4. | Thalassemia |
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Which one of the following is a wrong statement regarding mutations?
1. Deletion and insertion of base pairs cause frame-shift mutations
2. Cancer cells commonly show chromosomal aberrations
3. UV and Gamma rays are mutagens
4. Change in a single base pair of DNA does not cause mutation
F2 generation in a Mendelian cross showed that both genotypic and phenotypic ratios are same as 1 : 2 : 1 It represents a case of :
1. Co-dominance
2. Dihybrid cross
3. Monohybrid cross with complete dominance
4. Monohybrid cross with incomplete dominance
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