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 "

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Biology - 12th Class Biology Chapter 22 Short Questions Preparation

Question # 1

Define gene and locus.

  • Ans 1: Gene is unit of inheritance. Or it may be defined as
  • Ans 2: The sequence of nucleotides which determines the amino acid sequence of a protein is called gene and the position of a gene on the chromosomes is known as locus.
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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

Define gene and locus.

  • Ans 1: Gene is unit of inheritance. Or it may be defined as
  • Ans 2: The sequence of nucleotides which determines the amino acid sequence of a protein is called gene and the position of a gene on the chromosomes is known as locus.
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12th Class Biology Chapter 22 Short Questions Preparation - Set 2

Question # 1

Differentiate between multifactorial and polygenic traits.

  • Ans 1: Multifactorial traits: Traits which are controlled by many genes (polygenes) with combination of environment are called multifactorial traits.
  • Ans 2: Polygenic Inheritance: The quantitive are called polygenic traits.These traits are controlled by more than two pairs of genes.Each polygene has small positive or negative effect on characters.
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12th Class Biology Chapter 22 Short Questions Preparation - Set 3

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 Preparation - Set 4

Question # 1

What is contribution of Carl Correns in genetics?

  • Ans 1: Carl Correns discovered the phenomenon of incomplete dominance.
    He crossed red flowered 4 O clock plant with while flowered 4 O clock plant.In f1pink flowers were produced instead of red color was dominant.He again crossed pink flowers from F1,in F2 red,pink white flowers obtained with ratio 1:2:1 respectively.
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12th Class Biology Chapter 22 Short Questions Preparation - Set 5

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 6

Question # 1

Differentiate between co-dominance and over dominance.

  • Ans 1: Co-dominance: Different alleles of a gene that are both expressed in a heterozygous condition are called codominant and this phenomenon is called codominance.e.g if a man of M blood group marries a woman of N blood group,all their children will have MN blood group.
  • Ans 2: Over-dominance: This dominance relation is fascinating because the overdominant heterozygote exceeds in quantity the phenotypic expression of both the homozygotes.e.g In fruit fly Drosophila the heterozygote W+/W or white eye w/w homozygotes.
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12th Class Biology Chapter 22 Short Questions

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