Q. No.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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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 |
What is the F2 phenotypic ratio in cases of incomplete dominance?
| 1. | 1 : 1 | 2. | 3 : 1 |
| 3. | 1 : 2 : 1 | 4. | 1 : 1 |
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The famous double helix model of DNA was proposed by Watson and Crick in ____ and they shared Nobel Prize for Physiology or Medicine in ________ for their effort.
| 1. | 1951, 1971 | 2. | 1943, 1963 |
| 3. | 1953, 1962 | 4. | 1969, 1972 |
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Which of the following is a recessive trait for a character chosen by Mendel in garden pea?
| 1. | Violet flower colour | 2. | Yellow pod colour |
| 3. | Axial flower position | 4. | Tall stem height |
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To study whether a gene exhibits multiple allelism or not, one must study:
| 1. | An individual | 2. | A population |
| 3. | A species | 4. | With concentration! |
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A graphical representation to calculate the probability of all possible genotypes of offspring in a genetic cross is called as:
| 1. | Forked line diagram | 2. | Punnett square |
| 3. | Pedigree chart | 4. | Idiogram |
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‘When two pairs of traits are combined in a hybrid, segregation of one pair of characters is independent of the other pair of characters’. This is the statement of:
1. Law of Dominance
2. Law of segregation
3. Law of Independent Assortment
4. Law of Linkage
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Mendelian disorders are mainly determined by:
| 1. | Alteration or mutation in a single gene. |
| 2. | Chromosomal gross structural changes. |
| 3. | Recombination between linked genes. |
| 4. | Jumping genes |
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In 1900, Mendel’s work was rediscovered by:
| 1. | Khorana, Nirenberg and Mathei |
| 2. | de Vries, Correns and von Tschermak |
| 3. | Avery, McCleod and McCarty |
| 4. | Watson, Crick and Wilkins |
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