Multiple Choice Questions

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

  • complementary genes

  • blending inheritance

  • multiple alleles

  • pseudo alleles


B.

blending inheritance

Incomplete dominance or blending inheritance was first seen in Mirabilis jalapa (4'O clock plant). Here when red flowers are crossed with white flowers variety the F1 hybrid is pink and F2 ratio is 1 red : 2 pink : 1 white.


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Cleavage polyembryony occurs in

  • Pinus

  • Mini Cycas

  • Cycas

  • Ephedra


Which of the following is a test cross ?

  • Tt x tt

  • TT x tt

  • Tt x Tt

  • tt x tt


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

  • a bacterium

  • a fungus

  • a virus


The embryo at 16 celled stage is known as

  • morula

  • gastrula

  • blastula

  • blastomere


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Ozone depletion in stratosphere would result in

  • forest fires

  • global warming

  • skin cancer incidence

  • None of the above


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

  • vas deferens

  • cauda epididymis

  • gubernaculum

  • caput epididymis


DNA multiplication is called

  • translation

  • replication

  • transduction

  • transcription


Stop codons are

  • AUG, GUG

  • UAA, UGA, UAG

  • UAC, UGG

  • AGU, AGA, UAC


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Jumping genes in maize were discovered by

  • Hugo de Vries

  • Barbara McClintock

  • TH Morgan

  • Mendel