BIO301 Midterm Past Papers

Bio301 Mcq’s

1The mutation that changes a mutant phenotype back into the wild type. __Reverse mutation

2. Which genotype is not of the golden cast color in Labrador retriever? __________________bbee
3. Most common phenotype in natural populations of the organism is called ____________Wild type phenotype
4. Which statement is correct about DNA methylation? ______________-DNA methylation is the addition of a methyl group ta the DNA base cytosine (C)
5. Which blood group does not carry any antigen? ________________ o
6. Base analogs have similar structures with _____________________Standard bases of DNA
7. In case of summer squash, which statement is not correct?___Dominant W locus inhibit the color
8. .....Changes the wild type phenotype into mutant type phenotype. ____Forward mutation
9. The tendency of two or more than two genes to stay together during inheritance is called___________Linkage
10. Suppressor mutations are useful for identifying new ......... Sites which affect a biological process

of interest ______Genetic

11. ….is & type of mutation that has effect on DNA sequence but no effect on the protein. __________Silent mutation
12. Mutations that cause loss of functions are usually ______________Recessive
13. How many numbers of alleles can generate 10 genotypes? __________Genes with 4 alleles
14. …10-15 % of chromosomal deletions occur due to _____________Balanced translocations
15. Which two alleles are called co-dominant one another and are expressed when present?______________Allele A and Allele B
16. Suppose that the distance between two genes on a linkage map is 7 units. The cross-over

frequency between the two genes is ____________O.7%

17. Organisms that exhibit suppressor mutations is/are ____________Double mutant
18. Formation of pluripotent cells from totipotent cells is called _______Cellular differentiation
19. If purines (A/G) is replaced by purines and pyrimidines (T/C) is replaced by pyrimidinesis_________Transition
20. WHICH OF THE FOLLOWING STATEMENT IS NOT CORRECT ABOUT MEIOSIS 1…._____NONE OF THE MENTIONED ABOVE.
21. THE DIAMETER OF CONDENSED SCAFFOLD ASSOCIATED CHROMATIN IS___________- 30NM
22. WHICH OF THE FOLLOWING STATEMENT IS NOT CORRECT ABOUT CONTINOUS VARIATION?... ______________________CONTINUOUS VARIATION HAS DISTINCT CATEGORIES.
23. A HEREDITY UNIT ON CHROMOSOMES IS CALLED …______________________ GENE.