Biology MCQ class 12th

What is the branch of biology that deals with the inheritance and variation of characters from parents to offspring?

• Ecology

• Genetics

• Physiology

• Botany

Who conducted hybridisation experiments on garden peas and proposed the laws of inheritance in living organisms?

• Alfred Wallace

• Charles Darwin

• Louis Pasteur

• Gregor Mendel

What is the process by which characters are passed on from parent to progeny?

• Evolution

• Selection

• Mutation

• Inheritance

In Mendel's experiments, what is the genotype of a true-breeding tall pea plant?

• TT

• tt

• Tt

• YY

What is the phenotype of a plant with the genotype Tt according to Mendel's experiments?

• Tall

• Dwarf

• In-between height

• Green

In the ABO blood grouping system, which blood type is controlled by the gene I^A I^A or I^A i?

• Type B

• Type O

• Type A

• Type AB

What is the genotypic ratio in the F2 generation of a monohybrid cross according to Mendel's experiments?

• 2:1

• 3:1

• 1:2:1

• 9:3:3:1

Which scientists independently rediscovered Mendel's results on the inheritance of characters in 1900?

• Watson and Crick

• Sutton and Boveri

• de Vries, Correns, and von Tschermak

• Morgan and colleagues

What did Walter Sutton and Theodore Boveri use to explain Mendel's laws?

• Ribosomes

• Chromosomes

• Mitochondria

• Enzymes

Which organism did Thomas Hunt Morgan work with to experimentally verify the chromosomal theory of inheritance?

• Fruit Flies

• Mice

• Fungi

• Bacteria