A person with unknown blood group under ABO system has suffered much blood loss in an accident and needs an immediate blood transfusion. His one friend who has a valid certificate of his own blood type offers for blood donation without delay. What would have been the type of blood group of the donor friend?

  • Type AB

  • Type O

  • Type A

  • Type A


B.

Type O

Blood type 'O' has no any antigen but both types of antibodies 'a' and 'b'. The person with blood type 'O' is a universal donor.

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peptide synthesis inside a cell takes place in 

  • mitochondria

  • chromoplast

  • ribosomes 

  • ribosomes 


C.

ribosomes 

The cellular factory responsible for synthesising proteins (peptide synthesis) is the ribosome.

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Mutations can be induced with

  • IAA

  • ethylene

  • gamma radiations

  • gamma radiations


C.

gamma radiations

Gamma radiations are ionising radiation and are physical mutagens. They are used as mutagens in such materials, where the nucleus is deep-seated, e.g, seeds, stem cuttings, etc. 'Sharbati Sonora' variety of wheat has been developed by gamma radiations on 'Sonora- 64' variety (Mexican dwarf wheat variety).

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Test cross in plants of in Drosophila involves crossing 

  • Between two genotypes with recessive trait

  • Between two F1 hybrids

  • the F1 hybrid with a double recessive genotype

  • the F1 hybrid with a double recessive genotype


C.

the F1 hybrid with a double recessive genotype

When F1 hybrid is crossed with a recessive parent then it is called test cross. It is also a backcross. A test cross is done to test whether the dominant parent is heterozygous or homozygous.

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Which one of the following conditions correctly describes the manner of determining the sex in the given samples?

  • XO type of sex chromosomes determine male sex in grasshopper

  • XO condition in humans as found in Turner syndrome determines female sex

  • Homozygous sex chromosomes (XX) produce male in Drosophila

  • Homozygous sex chromosomes (XX) produce male in Drosophila


A.

XO type of sex chromosomes determine male sex in grasshopper

Grasshopper is an example of XO type of sex determination in which the males have only one X - chromosome besides the autosomes, whereas females have a pair of X - chromosomes.

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