Biology Genetics Test Online MCQs

1. In genetic engineering, which of the following is used? 

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

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

4. Pure line breed refers to

5. Given below is a representation of a kind of chromosomal mutation. What is the kind of mutation represented? 

6. Polygenic genes show

7. What is true about t-RNA?

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

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

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

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

12. XO chromosomal abnormality in humans causes

13. Okazaki fragments form

14. 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?

15. Restriction endonucleases are used as