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In the following human pedigree, the filled symbols represent the affected individuals. Identify the type of given pedigree.

  • Option 1)

    X-linked recessive

  • Option 2)

    Autosomal recessive

  • Option 3)

    X-linked dominant

  • Option 4)

    Autosomal dominant

 
As we discussed in concept Pedigree analysis in human genetics - In human genetics, the pedigree study provides a strong tool, which is utilised to trace the inheritance of a specific trait, abnormality or disease. - wherein Some of the important symbols used in the pedigree analysis are shown.    The given pedigree shows the autosomal recessive disorder. In this disorder, the individual...
Medical
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In his classic experiments on pea plants, Mendel did not use :

  • Option 1)

    Pod length

  • Option 2)

    Seed shape

  • Option 3)

    Flower position

  • Option 4)

    Seed colour

 
As dicussed in Mendel's experiment - Mendel investigated characters in the garden pea plants thet were manifested as two opposing traits eg- dwarf plants, yellow or green seeds. - wherein This allowed him to set up a basic frame-work of rules governing inheritance.     Inheritance of two genes - Mendel crossed plants that differed in two characters colour and shape. - wherein As a result,...
Medical
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Identify the correct order of organisation of genetic material from largest to smallest:

  • Option 1)

    Genome, chromosome, nucleotide, gene

  • Option 2)

    Genome, chromosome, gene, nucleotide

  • Option 3)

    Chromosome, genome, nucleotide, gene

  • Option 4)

    Chromosome, gene, genome, nucleotide

 
As discussed in Chromosomes - Structure in nucleus that appeared to double and divide just before each cell division.  - wherein Discovered by de Vries, correns and Von Tschermark     Feature of Human genome - Repetitive sequence are stretches of DNA sequence that are repeated many times, sometimes hundred to thousand times. They are thought to have no direct coding functions, but they shed...
Medical
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The wings of a bird and the wings of an insect are :

  • Option 1)

    analogous structures and represent convergent evolution

  • Option 2)

    phylogenetic structures and represent divergent evolution

  • Option 3)

    homologous structures and represent convergent evolution

  • Option 4)

    homologous structures and represent divergent evolution

 
As discussed Analogous Organs - The organs which have the same function and superficially alike but are quite different in fundamental structure and embryonic origin. - wherein Eg: insect and bird wings, Dragonfly, pterodactyl, Eagle, humorous, bat.    The organs which have the same function and superficially alike but are quite different in fundamental structure and embryonic origin. Option...
Medical
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The term "linkage" was coined by :

  • Option 1)

    T. Boveri

  • Option 2)

    G. Mendel

  • Option 3)

    W. Sutton

  • Option 4)

    T.H. Morgan

 
As discussed in Linkage - Morgan experimented and found that when the two genes in a hybrid cross situated on same chromosone, the proportion of parental gene combination were much higher than the non-parental type. - wherein Morgan attributes this to the physical association or linkage of the two genes and called it linkage.     Option 1) T. Boveri This solution is incorrect  Option 2) G....
Medical
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Satellite DNA is important because it:

  • Option 1)

    shows high degree of polymorphism in population and also the same degree of polymorphism in an individual, which is heritable from parents to children.

  • Option 2)

    does not code for proteins and is same in all members of the population.

  • Option 3)

    codes for enzymes needed for DNA replication.

  • Option 4)

    codes for proteins needed in cell cycle.

 
As learnt in DNA fingerprinting - The technique of DNA fingerprinting was initially developed by Alec Jeffery. - wherein He used a satellite DNA as probe that shows very high degree of polymorphism.     Shows high degree of polymorphism in population and also the same degree of polymorphismin an individual, which is heritable from parents to children. Option 1) shows high degree of...
Medical
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Industrial melanism is an example of:

  • Option 1)

    Natural selection

  • Option 2)

    Mutation

  • Option 3)

    Neo Lamarckism

  • Option 4)

    Neo Darwinism

 
  Industrial Melanism - It is the appearance of dark melanic forms of some organism like moths in the industrial region where soot emission from burning of coal has been heavy so as to color the background. - wherein Example of the moth that survived natural selection as it was black and escaped unnoticed by the birds.     Option 1) Natural selection This option is correct. Option...
Medical
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Balbiani rings are sites of :

  • Option 1)

    Nucleotide synthesis

  • Option 2)

    Polysaccharide synthesis

  • Option 3)

    RNA and protein synthesis

  • Option 4)

    Lipid synthesis

 
As we learnt in Activators and repressors - In a transcription unit, the activity of RNA polymerase at a given promoter is in turn regulated by interaction with accessory proteins which affect its ability to recog - wherein These regulatory proteins can both positively (activators) and negatively (repressors).    A Balbiani ring is a large chromosome puff. Balbiani rings are diffused uncoiled...
Medical
238 Views   |  

A gene showing codominance has :

  • Option 1)

    alleles tightly linked on the same chromosome

  • Option 2)

    alleles that are recessive to each other

  • Option 3)

    both alleles independently expressed in the hetero zygote

  • Option 4)

    one allele dominant on the other

 
As learnt in Co-dominance explained in red-blood cells - Red-blood cells are controlled by gene (I). RBC's have sugar attached to surface which is controlled by the gene (I). The gene (I) has three alleles : IA , IB and    - wherein The allele of gene (I), IA and IB process sugar of different forms while   does not produce any.    A gene shows codominance when both alleles in heterozygous...
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