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 haemophillia?Give its type.

  • Ans 1: Haemophilia is rare x-linked recessive trait.Haemophilic's blood does not clot properly after an injury,because it has either a reduction or malfunction or complete absence of blood clotting factor.
    It types are Haemophilia A,haemophilia B and haemophila C.
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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 haemophillia?Give its type.

  • Ans 1: Haemophilia is rare x-linked recessive trait.Haemophilic's blood does not clot properly after an injury,because it has either a reduction or malfunction or complete absence of blood clotting factor.
    It types are Haemophilia A,haemophilia B and haemophila C.
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12th Class Biology Chapter 22 Short Questions Preparation - Set 2

Question # 1

Define product rule and pseudoautosomal genes.

  • Ans 1: The genes which are located both on x and y chromosomes are called x and y linked genes or pseudoautosomal genes because their pattern of inheritance is like autosomal genes.
  • Ans 2: Product rule: When we multiply probabilities of two different event,this phenomenon is called product rule.
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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

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 5

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 6

Question # 1

What are sex influenced traits?Give an example.

  • Ans 1: Sex influencing traits occurs in both males and females but more common in one sex.It is controlled by an allele that is dominant in one sex but recessive in other.The difference in expression is due hormonal difference in two sexes.E.g, patteren baldness is sex influenced trait.
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12th Class Biology Chapter 22 Short Questions

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