What is the F2 phenotypic ratio in cases of incomplete dominance?
1. | 1 : 1 | 2. | 3 : 1 |
3. | 1 : 2 : 1 | 4. | 1 : 1 |
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 |
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 |
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! |
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 |
‘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
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 |
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 |
What can be the blood groups of progeny whose father and mother are of AB and O blood groups, respectively?
1. | A and B only | 2. | AB only |
3. | All except O | 4. | A, B, AB, and O |
In the case of starch synthesis in pea seeds [controlled by the B gene], BB homozygotes produce large and round starch grains; bb homozygotes produce smaller and wrinkled starch grains and heterozygotes produce round seeds of intermediate size. What can be inferred from this observation?
1. | The gene B mutates at a faster rate |
2. | The gene B is easily influenced by the environment |
3. | Dominance is not an autonomous feature of a gene or the product that it has information for. |
4. | Some genes do not follow the law of segregation. |