Q. No.Thalassemia and sickle cell anemia are caused due to a problem in globin molecule synthesis. Select the correct statement :
1.
Both are due to a qualitative defect in globin chain synthesis.
2.
Both are due to a quantitative defect in globin chain synthesis.
3.
Thalassemia is due to less synthesis of globin molecules.
4.
Sickle cell anemia is due to a quantitative problem of globin molecules
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A disease caused by an autosomal primary non-disjunction is:
1. Down's Syndrome
2. Klinefelter's Syndrome
3. Turner's Syndrome
4. Sickle Cell Anemia
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Match each item in Column I with one in Column II and select your answer from the codes given:
| Column I | Column II | ||
| Scientist | Contribution | ||
| A. | Francis Crick | a. | Breaking the genetic code |
| B. | Nirenberg | b. | Established Coenorhabditiselegans as a model genetics study organism |
| C. | Benzer | c. | Central dogma of molecular biology |
| D. | Brenner | d. | Bacteriophage genetics |
Codes:
| A. | B. | C. | D. | |
| 1. | c | a | d | b |
| 2. | c | a | b | d |
| 3. | a | b | c | d |
| 4. | a | c | d | b |
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The inheritance of flower colour in dog flower and 4’O clock plant exhibits:
| 1. | Complete dominance | 2. | Incomplete dominance |
| 3. | Co-dominance | 4. | Lethality |
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Morgan coined the term ______ to describe this physical association of genes on a chromosome and the term _________ to describe the generation of non-parental gene combinations.
| 1. | Recombination; Linkage | 2. | Linkage, Mutation |
| 3. | Transposition, Mutation | 4. | Linkage, Recombination |
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Occasionally, a single gene product may produce more than one effect. Such a gene is said to be:
| 1. | Pleiotropic | 2. | Polygenic |
| 3. | Psuedoallele | 4. | Housekeeping |
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What is the F2 genotypic ratio in cases of incomplete dominance?
| 1. | 1 : 1 | 2. | 3 : 1 |
| 3. | 1 : 2 : 1 | 4. | 1 : 1 |
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Suppose a gene has seven alleles. What would be the number of alleles in an individual at any instant?
| 1. | 1 | 2. | 7 |
| 3. | 2 | 4. | 3 |
A couple has a daughter. What is the probability that their next child will be a daughter?
| 1. | 0 % | 2. | 25 % |
| 3. | 50 % | 4. | 100 % |
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The mechanism of sex determination in grasshoppers is:
| 1. | XX – XY; male heterogamety |
| 2. | XX – XY; female heterogamety |
| 3. | XX – XO; male heterogamety |
| 4. | XX – XO; female heterogamety |
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