Q. No.Genetics, an important branch of biology, is best defined as:
1.
The study of the transmission of traits from parent to offspring.
2.
The study of genes and traits defined by genes.
3.
The study of DNA.
4.
The study of variation between members of a species.
In a dihybrid cross, AaBb x AaBb, the fraction of the offspring that will be homozygous for both traits is:
| 1. | 1/16 | 2. | 1/8 |
| 3. | 3/16 | 4. | ¼ |
Black coat colour is a dominant trait while the albino trait is recessive in mice. You want to raise only black-coat mice as they appear more graceful to you. You crossed black mice with albino mice thinking that all progeny will be black based on dominance. You felt disappointed when your cross yielded only three black-coat mice out of seven. This is because you incorrectly:
| 1. | assumed that black alleles were more common than white. |
| 2. | assumed that white alleles were more common than black. |
| 3. | assumed that my black mouse was true-breeding. |
| 4. | assumed that my white mouse was true-breeding. |
Consider crossing over does not take place between chromosomes shown as:
(i) Chromosome 1: ABC/abc
(ii) Chromosome 2:Qr, qr.
Which of the following gametes will not be formed by this organism?
| 1. | ABCqr | 2. | abcqr |
| 3. | ABcqr | 4. | abcQr |
What would be the correct definition of a ‘locus’ in genetics ?
| 1. | One version of a gene. |
| 2. | The location of a gene along the chromosome. |
| 3. | The character of the gene effects. |
| 4. | The mechanism of action of a gene. |
Half of the mice (all males) have yellow body colour while the females are wild type(gray) in a cross between true-breeding wild type male flies and true-breeding female flies with yellow body colour. This, most likely, is due to the fact that:
| 1. | Some of your females had already mated with yellow males before you collected them. |
| 2. | Some of your parental flies must have had a new mutation in their germ cells. |
| 3. | The mutation which causes yellow body color is on the X chromosome. |
| 4. | The mutation which causes yellow body color is on the Y chromosome. |
PisumSativum is self-pollinated in crops. Why this can be a problem when used for experiments like those conducted by Mendel?
| 1. | Self-pollinated plants tend to be weaker and require more care. |
| 2. | Self-pollinated plants are not able to produce viable seeds due to inbreeding. |
| 3. | Stamens must be removed from self-pollinated plants to control fertilization. |
| 4. | Pistils of self-pollinated plants are unable to accept pollen from other plants. |
Which of the following statements regarding ‘gene’ will be correct?
| I. | Can be described as a unit of heredity. |
| II. | Contains information to produce a particular protein. |
| III. | Affects traits at the cellular level. |
| IV. | Can exist in many forms. |
The correct statements include:
| 1. | I, II, and III only | 2. | II, III, and IV only |
| 3. | I, III, and IV only | 4. | I, II, III, and IV |
The inheritance of the trait shown in the given pedigree cannot be a/an:
| I. | Autosomal dominant disorder |
| II. | Sex-linked dominant disorder |
| III. | Holandric disorder |
| 1. | Only I and II | 2. | Only I and III |
| 3. | Only II and III | 4. | I, II, and III |
Identify the correct statements regarding linked genes:
| I. | are located near each other on the same chromosome. |
| II. | violate the law of independent assortment. |
| III. | segregate together during meiosis. |
| 1. | I & II only | 2. | I & III only |
| 3. | II & III only | 4. | I, II & III |
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