Q. No.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
(i) Chromosome 1: ABC/abc
(ii) Chromosome 2:Qr, qr.
Which of the following gametes will not be formed by this organism?
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. |
The choice of garden peas was largely responsible for success of Mendel. All the following characteristics made the plant useful for study of genetics except:
1. They are diploid and produce haploid gametes.
2. They have a complex phenotype with much genetic variability.
3. They are relatively small and easy to grow.
4. They produce edible fruit.
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. |
What would be true for study of karyotype of an organism, for example, humans?
1. Microscopic analysis could allow identification of unusual cellular structures.
2. An individual could be matched to a forensic sample based on identical karyotypes.
3. A specific gene which causes a genetic disorder could be identified.
4. Genetic disorders caused by chromosomal rearrangements could be diagnosed.
Identify the incorrect statement regarding a sex limited trait:
1. This term refers to a trait controlled by a gene located on the X or Y chromosomes.
2. This is a trait that occurs more frequently in one sex than another.
3. This is an extreme example of a sex influenced trait.
4. This trait is likely to be a secondary sex characteristic.
What is the essential difference between chromosomes in a prokaryotic and a eukaryote?
1. Eukaryotes are diploid while prokaryotes are haploid.
2. Al DNA in prokaryotes is in cytoplasm and in eukaryotes in nucleus
3. Eukaryotes have linear chromosomes while most prokaryotes contain a single circular chromsome.
4. No packaging of DNA occurs in prokaryotes and DNA is packaged only in eukaryotes
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 consequences of F factor mediated conjugation in bacteria is:
1. both strains are F+.
2. transfer of complete bacterial chromosome.
3. conversion of the recipient strain to F+ and the donor to F-.
4. both strains are F-
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