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Conditions of a karyotype 2n +- 1 and 2n...

Conditions of a karyotype 2n `+-` 1 and 2n `+-`2 are called

A

Aneuploidy

B

Polyploidy

C

Allopolyploidy

D

Monosomy

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The correct Answer is:
A
Aneuploidy represent chromosomes number different than multiple of basic chromosome number. it is due to failure of segregation of chromatids during cell division which results in the gain or loss of a chromosome(s), called aneuploidy. Aneuploidy arises due to non-disjunction of homologous chromosome.
= Aneuploidy is of four types: (i) Monosomy = 2n-1 (ii) Nullisomy = 2n - 2 (iii) Trisomy = 2n + 1 (iv) Tetrasomy = 2n +2
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KUMAR PRAKASHAN-PRINCIPLES OF INHERITANCE AND VARIATION -SECTION -E (SOLUTION OF NCERT EXEMPLAR ) (MULTIPLE CHOICE QUESTION (MCQS))
  1. All genes located on the same chromosome

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  2. Conditions of a karyotype 2n +- 1 and 2n +-2 are called

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  3. Distance between the genes and percentage of recombination shows

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  4. If a genetic disease is transferred from a phenotypically normal but c...

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  5. In sickle-cell anaemia Glutamic acid is replaced by Valine. Which one ...

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  6. Person having genotype I^A I^B would show the blood group as AB. This ...

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  7. ZZ/ZW type of sex determination is seen in

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  8. A cross between two tall plants resulted in offspring having few dwarf...

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  9. In a dihybrid cross, if you get 9:3:3:1 ratio, it denotes that

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  10. Which of the following will not result in variations among siblings?

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  11. Mendel.s Law of independent assortment holds good for genes situated o...

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  12. Occasionally, a single gene, may express more than one effect. The phe...

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  13. In a certain taxon of insects, some have 17 chromosomes and the others...

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  14. The inheritance pattern of a gene over generations among humans is stu...

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  15. It is said that Mendel proposed that the factor controlling any charac...

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  16. Two genes .A. and .B. are linked. In a dihybrid cross involving these ...

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  17. In the F2 generation of a Mendelian dihybrid cross, the number of phen...

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  18. Mother and father of a person with .O. blood group have .A. and .B. bl...

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