Q. No.A dihybrid test cross results in a 1.2% frequency of recombination. This implies that:
1. genes are located on sex chromosomes.
2. genes are located on heterologous chromosomes.
3. genes exhibit epistatic two factor interaction.
4. genes are located very close to one another on the same chromosome.
1. genes are located on sex chromosomes.
2. genes are located on heterologous chromosomes.
3. genes exhibit epistatic two factor interaction.
4. genes are located very close to one another on the same chromosome.
In heterozygous condition, the dominant allele is able to express itself only in one sex. This is a
1. A sex limited trait
2. A sex influenced trait
3. A sex linked trait
4. sex-determining trait.
Given below are different levels of organization of genetic material. Arrange them in the correct descending order of their size:
| 1. | Genome, chromosome, gene, nucleotide |
| 2. | Gene, chromosome, nucleotide, genome |
| 3. | Chromosome, gene, genome, nucleotide |
| 4. | Chromosome, genome, nucleotide, gene |
Which field of genetics is the oldest?
1. Transmission genetics.
2. Molecular genetics.
3. Population genetics.
4. Developmental genetics.
‘Molecular genetics’ will be concerned with
1. Production of a new mutant allele of an interesting gene.
2. Hybridizing different varies of plant species
3. studying general allele frequency in a population
4. classification of newly discovered species
You cross pure line plants with red flowers and pure line plants with white flowers and all progeny plants had pink flowers. What would be the phenotypic ratio of progeny produced as a result of hybridizing two plants with pink flowers?
| 1. | All red offspring | 2. | 3 red: 1 white |
| 3. | 3 pink: 1 white | 4. | 1 red: 2 pink: 1 white |
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The physical basis of independent assortment is explained by which of the following stages of meiosis?
| 1. | Metaphase I | 2. | Anaphase I |
| 3. | Metaphase II | 4. | Anaphase II |
What might be the significance of creating a transgenic mice expressing gene for green fluorescent proteins enabling it to glow green in the dark?
1. They can be a source of pleasure for the kids
2. It served as an effective demonstration that an extra gene could be incorporated into and expressed in most tissues of a model organism.
3. They can be seen by predators in the dark
4. This helps identification of transgenic mice.
Match each item in COLUMN I [genetic disorder] with its description in Column II and select the correct answer from the codes given:
|
|
COLUMN I |
|
COLUMN II |
|
A. |
Huntington's disease |
a. |
Inability to metabolize certain lipids, affecting proper brain development and death in early childhood. |
|
B. |
Tay-Sachs disease |
b. |
Caused by a dominant single gene defect and generally does not appear until the individual is 35-45 years of age |
|
C. |
phenylketonuria |
c. |
Effects of this recessive disorder can be completely overcome by regulating the diet of the affected individual |
|
D. |
Cystic fibrosis |
d. |
This results from a defect in membrane proteins that normally function in chloride ion transport |
Codes:
A B C D
1. a b c d
2. b a c d
3. a b d c
4. b a d c
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. |
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