Multiple Choice Questions

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Jumping genes in maize were discovered by

  • Hugo de Vries

  • Barbara McClintock

  • TH Morgan

  • Mendel


B.

Barbara McClintock

Barbara McClintock discovered jumping genes. These are also known as movable genetic elements. They can move from one location to another in the chromosome.

R W Hedges and A E Jacob introduced the term transposon.

Mutation was introduced by Hugo de Vries.

Gene theory was proposed by T H Morgon.

Gregor Johann Mendel is known as Father of Genetics.


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In rabbit, head of epididymis present at the head of the testis is called

  • vas deferens

  • cauda epididymis

  • gubernaculum

  • caput epididymis


1 : 2 : 1 phenotypic and genotypic ratio is found in

  • complementary genes

  • blending inheritance

  • multiple alleles

  • pseudo alleles


The embryo at 16 celled stage is known as

  • morula

  • gastrula

  • blastula

  • blastomere


Cleavage polyembryony occurs in

  • Pinus

  • Mini Cycas

  • Cycas

  • Ephedra


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Ozone depletion in stratosphere would result in

  • forest fires

  • global warming

  • skin cancer incidence

  • None of the above


Foolish seedling disease of rice in Japan was caused by
  • the deficiency of nitrogen

  • a bacterium

  • a fungus

  • a virus


Which of the following is a test cross ?

  • Tt x tt

  • TT x tt

  • Tt x Tt

  • tt x tt


Stop codons are

  • AUG, GUG

  • UAA, UGA, UAG

  • UAC, UGG

  • AGU, AGA, UAC


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DNA multiplication is called

  • translation

  • replication

  • transduction

  • transcription