12th Class Fsc Biology Online Preparation for chapter 22 (Variation and Genetics)

Online Short Questions For Chapter 8 "12th Class Biology Chapter 22 Short Questions Preparation "

Try The Short Questions For 12th Class Biology Chapter 22 Short Questions Preparation

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Biology - 12th Class Biology Chapter 22 Short Questions Preparation

Question # 1

What is tetrad?

  • Ans 1: Each pair of homologous chromosome which consists of four chromatids is called tetrad.
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Prepare Complete Set Wise Questions For Chapter 8 "12th Class Biology Chapter 22 Short Questions Preparation "

12th Class Biology Chapter 22 Short Questions Preparation - Set 1

Question # 1

What is tetrad?

  • Ans 1: Each pair of homologous chromosome which consists of four chromatids is called tetrad.
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12th Class Biology Chapter 22 Short Questions Preparation - Set 2

Question # 1

What is epistasis?Ho it differs from dominance?

  • Ans 1: Epistasis: An effect caused by a gene or gene pair at one locus interferes with or hides the effect caused by another gene or gene pair at another locus,such a phenomenon of gene interaction is called epistasis.
    Epistasis must not be confused with dominance.
  • Ans 2: Dominance: Dominance is the relationship between alleles of the same gene occupying the same locus,but epistasis is the interaction between different genes occupying different loci.
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12th Class Biology Chapter 22 Short Questions Preparation - Set 3

Question # 1

What is Pleiotropy? Give one example.

  • Ans 1: When a single gene affects two or more traits the phenomenon is called pleiotropy. E.g, genes that effect growth rate in human also influence both weight and height.
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12th Class Biology Chapter 22 Short Questions Preparation - Set 4

Question # 1

Define incomplete dominance,Give example

  • Ans 1: When the phenotype of the heterozygote is intermediate between phenotypes of the two homozygotes,it is called incomplete dominance.
    Example: flower colouring in 4'0 clock plant.
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12th Class Biology Chapter 22 Short Questions Preparation - Set 5

Question # 1

Differentiate between multiple alleles and polygenes..

  • Ans 1: Multiple alleles: If a gene has more than two alternate forms these are called multiple alleles.For example alleles for ABO blood group. E.g,alleles for ABO blood group.
  • Ans 2: Polygenes: When a continuously varying trait is controlled by alleles for two or more than two different gene pairs found at different loci,all influencing the same trait in an additive way,such genes are called polygenes, e.g,genes for controlling skin and eye colour in human.
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12th Class Biology Chapter 22 Short Questions Preparation - Set 6

Question # 1

State Law of independent assortment.

  • Ans 1: When two contrasting pairs of traits are followed in the same cross,their alleles are assorted independently into gametes.
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12th Class Biology Chapter 22 Short Questions

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