CHSE Biology Heredity And Variation (Genetics) Previous 10-year Questions

Chapter- Heredity and Variation (Genetics)

One mark questions:-

1. Monohybrid cross yields ______ numbers of genotype. (CHSE – 2014)
2. The term ‘gene’ was coined by _____ in the year 1909. (CHSE – 2015)
3. In a cross between red and white flowered plants, F1 hybrids are pink. This is called ______ dominance. (CHSE – 2016)
4. _______ coined the term ‘gene’ for Mendelian factor. (CHSE – 2017)
5. If allele for tallness (TT) is dominant and dwarfness (tt) is recessive, then in a cross between ________, 50% of the offspring will be dwarf. (CHSE – 2018)
   • TT x tt
   • Tt x tt
   • tt x tt
   • Tt x Tt
6. The phenomenon of single gene contributing to multiple phenotypic traits is called _______. (CHSE – 2019)
   • pleiotropy
   • codominance
   • incomplete dominance
   • polygenic inheritance
7. Mutation that completely eliminates a gene is called ________ mutation. (CHSE – 2019)

Short notes / short answer type questions and differentiate: -

1. Multiple allelism (CHSE – 2012)
2. Backcross and testcross (CHSE – 2013)
3. Mendel's principle of dominance (CHSE – 2014)
4. Hybrids and cybrids (differentiate) (CHSE – 2014)
5. Quantitative inheritance (CHSE – 2015)
6. Monohybrid cross and dihybrid cross (Differentiate) (CHSE – 2016)
7. Law of segregation (CHSE – 2017)
8. Hybridization (CHSE – 2017)
9. Cybrid and hybrid (Differentiate) (CHSE – 2017)
10. Codominance (CHSE – 2018)

Long questions: -

1. Explains Mendel’s dihybrid cross with a chequerboard.
2. Discuss Mendel’s dihybrid cross with checkerboard. (CHSE – 2018)