Biology Genetics Test Online MCQs

1. In DNA helix, cytosine is paired with guanine by

2. If a homozygous tall plant is crossed with homozygous dwarf plant, the off springs will be

3. If a homozygous red flowered plant is crossed with a homozygous white flowered plant, the off springs would be

4. The total number of nitrogenous bases in human genome is estimated to be about

5. Colchicine prevents the mitosis of cells at which of the following stage?

6. Discontinuous variations are

7. Grain colour in wheat is determined by three pairs of polygene. Following the cross AABBCC (dark colour) x aabbcc(light colour), in F₂ generation what proportion of the progeny is likely to resemble either parent?

8. Given below is a pedigree chart of a family with five children. It shows the inheritance of attached earlobes as opposed to the free ones. The squares represent the male individuals and circles the female individuals. Which one of the following conclusions drawn is correct?

9. Pure line breed refers to

10. Which one of the following pairs of terms/names mean one and the same thing?

11. What is true about t-RNA?

12. Frame shift mutation occurs when

13. Root cell of wheat has 42 chromosomes. What would be the number of chromosomes in the synergid cell?

14. Genes of which one of the following is present exclusively on the X-chromosome in humans?

15. Transposon was discovered by