Q. No.Two genes ‘A’ and ‘B’ are completely linked. In a dihybrid cross involving these two genes, the F1 heterozygote is crossed with a homozygous recessive parental type (aa bb). What would be the ratio of offspring in the next generation?
1. 1:1:1:1 2. 9:3:3:1 3. 3 : 1 4. 1 : 1
In the F2 generation of a Mendelian dihybrid cross, the number of phenotypes and genotypes are:
1. phenotypes - 4; genotypes - 16
2. phenotypes - 9; genotypes - 4
3. phenotypes - 4; genotypes - 8
4. phenotypes - 4; genotypes – 9
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Mother and father of a person with ‘O’ blood group have ‘A’ and ‘B’ blood group, respectively. What would be the genotype of both mother and father?
1. Mother is homozygous for ‘A’ blood group and father is heterozygous for ‘B’
2. Mother is heterozygous for ‘A’ blood group and father is homozygous for ‘B’
3. Both mother and father are heterozygous for ‘A’ and ‘B’ blood group, respectively
4. Both mother and father are homozygous for ‘A’ and ‘B’ blood group, respectively
Most favourite and ideal material for researches in genetics is
1. Housefly
2. Mosquito
3. Frog
4. Fruitfly.
Which one of the following traits of Garden Pea studied by Mendel was a recessive feature?
1. Axial flower position
2. Green seeds colour
3. Green pod colour
4. Round seed shape.
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Two crosses between the same pair of genotypes/phenotypes in which the sources of gametes are reversed in one cross are called
1. Test cross
2. Reverse cross
3. Dihybrid cross
4. Reciprocal cross
When a cluster of genes show linkage behaviour, they:
| 1. | Do not show chromosome map |
| 2. | Induce cell division |
| 3. | Do not show independent assortment |
| 4. | Show recombination during meiosis |
Linkage map of X-chromosome of fruitfly has 66 map units with yellow body gene(y) at one end & bobbed hair (b) at the other. The recombination frequency between y and b gene would be
1. 66%
2. > 50%
3. 50%
4. 100%
A harmful condition which is also a potential saviour from a mosquito borne infectious disease
1. Thalassemia
2. Sickle cell anaemia
3. Leukemia
4. Pernicious anaemia
Genetic map is one that
1. Establishes sites of the gene on a chromosome
2. Establishes the various stages in gene evolution
3. Shows the stages during cell division
4. Shows distribution of various species in a region
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