Q. No.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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If a father and son are both affected by red-green colour blindness, then what can be said definitely?
| I. | The son has received the trait from the father. |
| II. | The mother of the affected son has to be affected by red-green colour blindness. |
| III. | Any sister of the affected son can never be affected by red-green colour blindness. |
| 1. | I and II only | 2. | I and III only |
| 3. | II and III only | 4. | None |
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Two garden pea dihybrids with round seed shapes and yellow seed color [RrYy] are intercrossed. Assuming independent assortment, the gene for seed shape is inherited by the progeny in a phenotypic ratio of:
| 1. | 3: 1 | 2. | 1: 1 |
| 3. | 9:3:3:1 | 4. | 1:1:1:1 |
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Consider the following statements regarding
Y chromosome in humans:
| I. | Y chromosome is a male-determining chromosome in humans |
| II. | Y chromosome contains a gene, SRY, which triggers embryonic development as a male |
| III. | 50 % of sons of a male inherit his Y chromosome |
Of the given statements, the correct statements are:
| 1. | I and II only | 2. | I and III only |
| 3. | II and III only | 4. | I, II, and III |
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What decides the frequency of an allele in a population?
| 1. | Dominance |
| 2. | Its location on a particular chromosome |
| 3. | Its degree of expression |
| 4. | Natural selection |
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How many unique gametes could be produced through independent assortment by an individual with the genotype AaBbCCDdEE?
| 1. | 4 | 2. | 8 |
| 3. | 16 | 4. | 32 |
The improvement of microscopy techniques in the late 1800s set the stage for the emergence of modern genetics because:
| 1. | it revealed new and unanticipated features of Mendel’s pea plant varieties. |
| 2. | it allowed biologists to study meiosis and mitosis, revealing the parallels between the behaviors of genes and chromosomes. |
| 3. | it allowed scientists to see the DNA present within chromosomes. |
| 4. | it led to the discovery of mitochondria. |
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Male pattern baldness is a ___________ trait.
| 1. | Sex-linked | 2. | Sex-limited |
| 3. | Sex-influenced | 4. | Y-linked |
A sex aneuploid Drosophila has 2 sets of autosomes and sex chromosome complement XXY. This fly would be:
| 1. | A normal fertile female | 2. | A normal fertile male |
| 3. | An intersex | 4. | A metamale |
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