CBSE Class 12 Biology Principles of Inheritance and Variation Quiz 2

1. A true hybrid condition is:

A tt Rr B Tt rr C tt rr D Tt Rr

2. The allele which is unable to express its effect in the presence of another is called :

A Co-dominant B Supplementary C Complementary D Recessive

3. Most of the mutations are:

A Recessive B Harmful C Germinal D All of these

4. Smallest segment of genetic material affected by mutation is :

A Recon B Cistron C Muton D Exon

5. Genes located on V-chroinosome are:

A Mutant genes B Autosomal genes C Holandric genes D Sex-linked genes

6. A strong mutagen is:

A Cold B Heat C Water D X-rays

7. A point mutation is:

A Thalassemia B Sickel-cell anaemia C Down’s syndrome D Nightblindness

8. Mendel’s second law is of the law of:

A Segregation B Dominance C Polygenic inheritance D Independent assortment

9. An organism with two unlike genes of a trait is called :

A Homozygous B Hetrozygous C Both of these D None of these

10. Mendel’s laws were discovered by:

A Correns B Shermak C de meris D All of these