Q. No.A plant breeder is raising many varieties of plants. As a part of the breeding program, he raises pure line varieties by continuous inbreeding over several generations – one with red flowers and another with white flowers. How can Mendel's laws be demonstrated by hybridization between these varieties?
1.
Set up a monohybrid cross and determine if your F2 results are predicted by a 3:1 ratio based on the law of segregation.
2.
Set up a dihybrid cross and determine if your F2 results are predicted by a 9:3:3:1 ratio based on the law of independent assortment.
3.
Set a test cross to demonstrate that your traits breed true.
4.
Set up a two-point test cross to demonstrate that your genes are linked.
All the following are mechanisms of sex determination in living organisms except:
1. The Z-W system
2. The X-O system
3. The haplo-diploid system
4. The parthenogenetic system
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Pedigree analysis rather than conventional methods are used to study genetic traits because:
| I. | Number of progeny is limited |
| II. | Choice matings are not possible |
| III. | Sexual dimorphism is seen in humans |
| 1. | I only | 2. | II only |
| 3. | III only | 4. | Both I and II |
Match the disorder in Column I with the location of the gene causing it in Column II and select the correct option from the codes given:
|
|
COLUMN I |
|
COLUMN II |
|
A. |
Sickle cell anaemia |
a. |
Chromosome 11 |
|
B. |
Phenylketonuria |
b. |
Chromosome 12 |
|
C. |
Cystic fibrosis |
c. |
Chromosome 7 |
|
D. |
Huntington’s disease |
d. |
Chromosome 4 |
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 |
The pedigree shown below cannot be:
| I. | Autosomal dominant disorder |
| II. | Autosomal recessive disorder |
| III. | Sex-linked dominant disorder |
| IV. | Sex-linked recessive disorder |
| V. | Holandric disorder |
| 1. | I, II, and III only | 2. | I, II, III, and V only |
| 3. | I, III, IV, and V only | 4. | I, II, III, IV and V |
The recombination frequencies for four different linked genes of Drosophila are shown in the figure:
The order of the four genes will be:
| 1. | rb-cn-vg-b | 2. | vg-b-rb-cn |
| 3. | cn-rb-b-vg | 4. | b-rb-cn-vg |
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 |
The inheritance of the trait shown in the given pedigree is best explained as a/an:
1. Autosomal dominant disorder
2. Autosomal recessive disorder
3. Sex-linked dominant disorder
4. Sex-linked recessive disorder
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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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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