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. |
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. |