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Medical
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Which of the following characteristics represent 'Inheritance of blood groups' in humans ?

a. Dominance

b. Co-dominance

c. Multiple allele

d. Incomplete dominance

e. Polygenic inheritance

  • Option 1)

    b , d and e

  • Option 2)

    a , b and c

  • Option 3)

    b , c and e

  • Option 4)

    a , c and e

 

2

Medical
437 Views   |  

The similarity of bone structure in the forelimbs of many vertebrates is an example of

  • Option 1)

    Convergent evolution

  • Option 2)

    Analogy

  • Option 3)

    Homology

  • Option 4)

    Adaptive radiation

 

As we learnt in

Homologous Organs -

Organs which look different and perform different functions, but have similar basic structure, similar topography and embryonic origin.

- wherein

These are called homologous organs. Eg: forelimbs of vertebrates like the seal, bat, bird wings, dragonfly, pterodactyl, eagle, humorous bat.

fig 4

 

 In homology, in different vertebrates, bones of forelimbs are similar but their forelimbs are adapted in different way as per their adaptation.

 


Option 1)

Convergent evolution

This is incorrect.

Option 2)

Analogy

This is incorrect.

Option 3)

Homology

This is correct.

Option 4)

Adaptive radiation

This is incorrect.

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Medical
386 Views   |  

Among the following sets of examples for divergent evolution , select the incorrect option :

  • Option 1)

    Brain of bat , man and cheetah

  • Option 2)

    Heart of bat , man and cheetah

  • Option 3)

    Forelimbs of bat , man and cheetah

  • Option 4)

    Eye of octopus , bat and man

 

As we learnt in

Types of organic evolution -

  1. Divergent Evolution
  2. Co-Evaluation
  3. Progressive
  4. Microevolution
  5. Macroevolution
  6. Mega evolution
  7. Parallel evolution
  8. Convergent evolution

- wherein

 

 

 

Convergent or parallel evolution -

Different geographical areas exhibiting similar groups of plants and animals with strikingly similar appearance is called convergent or parallel evolution.

- wherein

These organisms may be distantly related.

 

Divergent evolution occurs in the same structure, example - forelimbs, heart, brain of vertebrates which have developed along different directions due to adaptation to different needs whereas eye of octopus, bat and man are examples of analogous organs showing convergent evolution.

 


Option 1)

Brain of bat , man and cheetah

This is incorrect.

Option 2)

Heart of bat , man and cheetah

This is incorrect.

Option 3)

Forelimbs of bat , man and cheetah

This is incorrect.

Option 4)

Eye of octopus , bat and man

This is correct.

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Medical
660 Views   |  

AGGTATCGCAT is a sequence from the coding strand of a gene. What will be the corresponding sequence of the transcribed mRNA ?

  • Option 1)

    ACCUAUGCGAU

  • Option 2)

    UGGTUTCGCAT

  • Option 3)

    AGGUAUCGCAU

  • Option 4)

    UCCAUAGCGUA

 

As we learnt in

DNA and RNA components -

Cytosine is common for both DNA and RNA and Thymine is present in DNA.

- wherein

Uracil is present in RNA at the place of thymine.

Coding strand and mRNA has same nucleotide sequence except, ‘T’ – Thymine is replaced by ‘U’–Uracil in mRNA. 

 


Option 1)

ACCUAUGCGAU

This is incorrect.

Option 2)

UGGTUTCGCAT

This is incorrect.

Option 3)

AGGUAUCGCAU

This is correct.

Option 4)

UCCAUAGCGUA

This is incorrect.

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Medical
943 Views   |  

According to Hugo de Vries , the mechanism of evolution is

  • Option 1)

    Phenotypic variations

  • Option 2)

    Saltation

  • Option 3)

    Multiple step mutations

  • Option 4)

    Minor mutations

 

As we learnt in

Discontinuous Distribution -

Descendants of a common ancestor in some cases inhabit different continents and also differ from each other. 

- wherein

This is called Discontinuous Distribution.

Eg., aligators and mangolias, tulip and sassafras

 

As per mutation theory given by Hugo de Vries, the evolution is a discontinuous phenomenon or saltatory phenomenon/saltation.

 


Option 1)

Phenotypic variations

This is incorrect.

Option 2)

Saltation

This is correct.

Option 3)

Multiple step mutations

This is incorrect.

Option 4)

Minor mutations

This is incorrect.

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Medical
154 Views   |  

A woman ha s X - linked condition on one of her X chromosomes . This chromosme can be inherited by

  • Option 1)

    Only grandchildren

  • Option 2)

    Only sons

  • Option 3)

    Only daughters

  • Option 4)

    Both sons and daughters

 

As we learnt in

Haemophilia -

This is sex-linked recessive disease, which shows transmission from unaffected carrier female to some of the male progeny.

- wherein

In this, a simple cut will result in non-stop bleeding and no blood clotting will take place.

 

• Woman is a carrier

• Both son & daughter inherit

X–chromosome

• Although only son be the diseased.

 


Option 1)

Only grandchildren

This is incorrect.

Option 2)

Only sons

This is incorrect.

Option 3)

Only daughters

This is incorrect.

Option 4)

Both sons and daughters

This is correct.

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Medical
290 Views   |  

All of the following are part of an operon except

  • Option 1)

    an enhancer

  • Option 2)

    structural genes

  • Option 3)

    an operator

  • Option 4)

    a promoter

 

As we learnt in

Haemophilia -

This is sex-linked recessive disease, which shows transmission from unaffected carrier female to some of the male progeny.

- wherein

In this, a simple cut will result in non-stop bleeding and no blood clotting will take place.

 

 

Operons are a part of prokaryotes and since Enhancer sequences are present in Eukaryote, operons are not a part of enhancer.


Option 1)

an enhancer

Correct

Option 2)

structural genes

Incorrect

Option 3)

an operator

Incorrect

Option 4)

a promoter

Incorrect

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Medical
841 Views   |  

The two functional groups characteristic of sugars are

  • Option 1)

    Carbonyl and phosphate

  • Option 2)

    Carbonyl and methyl

  • Option 3)

    hydroxyl and methyl

  • Option 4)

    Carbonyl and hydroxyl

 

option 4

Medical
130 Views   |  

Select the correct match :

  • Option 1)

    Matthew Meselson and F. Stahl  - Pisum sativum

  • Option 2)

    Alfred Hershey and Martha Chase - TMV

  • Option 3)

    Alec Jeffreys - Streptococcus pneumoniae

  • Option 4)

    Francois Jacob and Jacques Monod - Lac operon

 

As we learnt in 

The lac operon -

In lac operon, a polycistronic structural gene is regulated by a common promoter and regulatory genes. 

- wherein

Such arrangements are very common in bacteria and is referred to as operon. 

 

 Francois Jacob and Jacque Monod proposed model of gene regulation known as operon model/lac operon. 

Alec Jeffreys – DNA fingerprinting technique.

Matthew Meselson and F. Stahl – Semiconservative DNA replication in E. coli.

Alfred Hershey and Martha Chase – Proved DNA as genetic material not protein

 


Option 1)

Matthew Meselson and F. Stahl  - Pisum sativum

This is incorrect.

Option 2)

Alfred Hershey and Martha Chase - TMV

This is incorrect.

Option 3)

Alec Jeffreys - Streptococcus pneumoniae

This is incorrect.

Option 4)

Francois Jacob and Jacques Monod - Lac operon

This is correct.

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Medical
129 Views   |  

The experimental proof for semiconservative replication of DNA was first shown in a

  • Option 1)

    Plant

  • Option 2)

    Bacterium

  • Option 3)

    Fungus

  • Option 4)

    Virus

 

As we learnt in

Observations of experiments done by meselsons and stahl -

The DNA that was extracted from the culture of E.coli bacteria one generation after the transfer from 15 N to 14 N medium had a hybrid or intermediate density or DNA extracted another generation (40 minutes) was composed of an equal amount of this hybrid DNA

-

Semi-conservative DNA replication was first shown in Bacterium Escherichia coli by Matthew Meselson and Franklin Stahl.

 


Option 1)

Plant

This is incorrect.

Option 2)

Bacterium

This is correct.

Option 3)

Fungus

This is incorrect.

Option 4)

Virus

This is incorrect.

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Medical
120 Views   |  

Select the correct statement :

  • Option 1)

    Spliceosomes take part in translation .

  • Option 2)

    Punnett square was developed by a British scientist .

  • Option 3)

    Franklin Stahl coined the term "Linkage" .

  • Option 4)

    Transduction was discovered by S. Altman.

 

As we learnt in 

Punnett square -

The production of gametes by the parents , the formation of the Zygotes , the F1 and F2 plants can be understod by a punnett square

- wherein

It was developed a british geneticist reginald  C.Punnett.

Punnett square was developed by a British geneticist, Reginald C. Punnett. 

– Franklin Stahl proved semi-conservative mode of replication.

– Transduction was discovered by Zinder and Laderberg.

 

 


Option 1)

Spliceosomes take part in translation .

This is incorrect.

Option 2)

Punnett square was developed by a British scientist .

This is correct.

Option 3)

Franklin Stahl coined the term "Linkage" .

This is incorrect.

Option 4)

Transduction was discovered by S. Altman.

This is incorrect.

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Medical
125 Views   |  

Which of the following pairs is wrongly matched ?

  • Option 1)

    XO type sex determination : Grasshopper

  • Option 2)

    ABO blood grouping : Co - dominance

  • Option 3)

    Starch synthesis in pea : Multiple alleles

  • Option 4)

    T.H. Morgan : Linkage

 

As we learnt in

Alleles -

Genes which code for a pair of contrasting traits are known as alleles.

- wherein

They are slightly different forms of the same gene.

Starch synthesis in pea is controlled by pleiotropic gene. Pleiotropic gene has a multiple phenotypic effect because it can control expression of a number of characters.


Option 1)

XO type sex determination : Grasshopper

This is incorrect.

Option 2)

ABO blood grouping : Co - dominance

This is incorrect.

Option 3)

Starch synthesis in pea : Multiple alleles

This is correct.

Option 4)

T.H. Morgan : Linkage

This is incorrect.

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