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

Differentiate between homozygous and heterozygous.

  • Ans 1: Homozygous: If alleles of a gene pair are in similar from they are called homozygous.
  • Ans 2: Heterozygous: If the alleles of a gene pair are in different from they are called heterozygous.
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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

Differentiate between homozygous and heterozygous.

  • Ans 1: Homozygous: If alleles of a gene pair are in similar from they are called homozygous.
  • Ans 2: Heterozygous: If the alleles of a gene pair are in different from they are called heterozygous.
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12th Class Biology Chapter 22 Short Questions Preparation - Set 2

Question # 1

Explain genic system for determination of sex.

  • Ans 1: Many species of eukaryotic micro-organisms like yeast do not have sex chromosomes.These depend on genic system for determination of sex.In this system the sexes are specified by simple allelic differences at small number of gene loci.
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12th Class Biology Chapter 22 Short Questions Preparation - Set 3

Question # 1

What is Bombay Phenotype?

  • Ans 1: When in an individuals RBCs lack A and B antigens although the do not contain Ia and Ib genes.They are phenotypically like O blood group but are not genotypically like O.Their phenotype is called Bombay phenotype.
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12th Class Biology Chapter 22 Short Questions Preparation - Set 4

Question # 1

Compare between epistasis and poleiotropy.

  • Ans 1: Epistasis: When an effect caused by a gene pair on one locus interferes with or hides the effect caused by another gene or gene pair at another locus,it is called epistasis.
  • Ans 2: Poleiotropy: When a single gene affects two of more traits,the phenomenon is called pleiotropy.
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12th Class Biology Chapter 22 Short Questions Preparation - Set 5

Question # 1

Define pleiotropy. Give two examples.

  • Ans 1: When a gene more than one trait it is called pleiotropy. For example gene for eye colour in Drosophila also controls shape of spermathecae.
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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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