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

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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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 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 2

Question # 1

Differentiate between continuous and discontinuous variations.

  • Ans 1: Continuous variations: In Continuous variations many intermediate forms of a trait are present and organism show very small difference for a trait.For example skin color,eye color.
  • Ans 2: Discontinuous variations: In discontinuous variations very sharp difference is present and no intermediate forms are present for a trait.For example tongue rolling,attached or free pinna.
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12th Class Biology Chapter 22 Short Questions Preparation - Set 3

Question # 1

Differentiate between gene and allele.

  • Ans 1: Gene: Gene is the basic unit of biological information.In fact DNA allstorts of biological information coded in the sequence of its bases in a linear order and genes are actually parts of DNA comprising its base sequences.
  • Ans 2: Allele: Genes form pairs on pairs of homologous chromosomes.One member of a gene pair is located on one homologue and the other homologue and the other member on the other homologue partners of a gene pair are called alleles.
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12th Class Biology Chapter 22 Short Questions Preparation - Set 4

Question # 1

What is the product rule?

  • Ans 1: When two independent events are occurring simultaneously like in dihybrid cross,the ratio of each joint phenotypic combination can be obtained by multiplying the probabilities of individual phenotypes. It is called product rule.
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12th Class Biology Chapter 22 Short Questions Preparation - Set 5

Question # 1

What is beanbag genetics? Explain.

  • Ans 1: Beanbag genetics means that alleles are like a bean bag.The entire bean bag full of beans is the gene of the population.In the bean bag approach we can imagine the entire gene pool comprising all the alleles for all different traits at once,or we can just focus on some subset,such as all the alleles for a single trait
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12th Class Biology Chapter 22 Short Questions Preparation - Set 6

Question # 1

How does ABO incompatibility protect the developing baby against Rh-

  • Ans 1: Incompatiability
    Rh sensitization of Rh mother can be easily avoided If mother is given an injection of Rh antiserum during early pregnancy and immediately after birth.
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12th Class Biology Chapter 22 Short Questions

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