Q. No.In a certain taxon of insects, some have 17 chromosomes and others have 18 chromosomes. The 17 and 18 chromosome-bearing organisms are:
1. males and females, respectively
2. females and males, respectively
3. all males
4. all females
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The inheritance pattern of a gene over generations among humans is studied by pedigree analysis. The character studied in the pedigree analysis is equivalent to:
| 1. | quantitative trait | 2. | Mendelian trait |
| 3. | polygenic trait | 4. | maternal trait |
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It is said that Mendel proposed that the factor controlling any character is discrete and independent. His proposition was based on the:
| 1. | results of the F3 generation of a cross |
| 2. | observations that the offspring of a cross made between the plants having two contrasting characters shows only one character without any blending |
| 3. | self-pollination of F1 offspring |
| 4. | cross-pollination of F1 generation with recessive parent |
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In a plant, red fruit (R) is dominant over yellow fruit (r), and tallness (T) is dominant over shortness (t). A plant with RRTt genotype is crossed with a plant of rrtt genotype. The progeny is:
1. All red fruit, tall 25%
2. All red fruit, tall 50%
3. All red fruit and tall 75%
4. All red fruit and tall.
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Which of the following is the most suitable medium for the culture of Drosophila melanogaster?
| 1. | Cow dung | 2. | Moist bread |
| 3. | Agar agar | 4. | Ripe Banana |
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A human male produces diallelic sperms in equal proportion AB, Ab, aB, and ab. The genotype of the person would be:
| 1. | Aa Bb | 2. | Aa BB |
| 3. | AA Bb | 4. | AA BB. |
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The most popularly known blood grouping is the ABO grouping. It is named ABO and not ABC, because “O” in it refers to having:
| 1. | No anitgens A and B on RBCs |
| 2. | Other antigens besides A and B on RBCs |
| 3. | Overdominance of this type on the genes for A and B types |
| 4. | One antibody only - either anti-A or anti-B on the RBCs |
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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% |
If two persons with 'AB' blood group marry and have a sufficiently large number of children, these children could be classified as 'A' blood group: 'AB' blood group: 'B'blood group in a 1:2:1 ratio. The modern technique of protein electrophoresis reveals the presence of both' A' and 'B' type proteins in 'AB' blood group individuals. This is an example of:
| 1. | Incomplete dominance | 2. | Partial dominance |
| 3. | Complete dominance | 4. | Codominance |
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What is applicable to both Klinefelter’s syndrome and Turner’s syndrome?
| I. | They result from the non-disjunction of sex chromosomes during gamete formation |
| II. | They can be identified by a karyotype |
| III. | They have 44 autosomes |
| 1. | I and II only | 2. | I and III only |
| 3. | II and III only | 4. | I, II, and III |
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