Q. No.Two genes ‘A’ and ‘B’ are completely linked. In a dihybrid cross involving these two genes, the F1 heterozygote is crossed with a homozygous recessive parental type (aa bb). What would be the ratio of offspring in the next generation?
1. 1:1:1:1 2. 9:3:3:1 3. 3 : 1 4. 1 : 1
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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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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Which of the following father and son duos received Nobel Prize?
| 1. | Nirenbergs | 2. | Kornbergs |
| 3. | Darwins | 4. | Lederbergs |
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A plant, on repeated self-pollination, preserves the trait expressed for many generations. Such a plant is said to be:
| 1. | Panmictic | 2. | Homologous |
| 3. | Apomictic | 4. | Pure line |
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