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 are multiple alleles,give its example?

  • Ans 1: When a gene exists in more than two alternate forms called multiple alleles.Blood group ABO is an example of multiple alleles.
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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 are multiple alleles,give its example?

  • Ans 1: When a gene exists in more than two alternate forms called multiple alleles.Blood group ABO is an example of multiple alleles.
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12th Class Biology Chapter 22 Short Questions Preparation - Set 2

Question # 1

Explain gene and allele.

  • Ans 1: Gene is a part a DNA which can provide instruction for the synthesis of a protein.It is unit of inheritance.
  • Ans 2: Allele is an alternate from of gene.
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12th Class Biology Chapter 22 Short Questions Preparation - Set 3

Question # 1

What is hypophosphatemic rickets?

  • Ans 1: It is an X linked dominant trait.It is rare hereditary disease.it does not result from vitamin D deficiency but its cause is a genetic communication failure at molecular level.The genes encoding bone proteins never receive vitamin D message to function.
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12th Class Biology Chapter 22 Short Questions Preparation - Set 4

Question # 1

How sex is determined in plants?

  • Ans 1: Plants show a variety of sexual situations.Some species like Ginkgo are dio-ecious having plants of separate sexes.Male plants produce flower with only stamens and female plants produce flower with only carpels.Some dioecious plants have a difference of sex chromosome between the sexes.These have an X-Y system.These plants typically exhibit an X-choromosome autosome balance system for sex determination.
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12th Class Biology Chapter 22 Short Questions Preparation - Set 5

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 6

Question # 1

Define polygenic Inheritance.Give example.

  • Ans 1: Polygenic inheritance is that which is controlled by more than two pairs of gene are called polyegneic traits.For example wheat grain color,human eye and skin color.
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12th Class Biology Chapter 22 Short Questions

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