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 erythroblastosis foetalis?

  • Ans 1: Due to maternal-fetal Rh incompatibility,there is destruction of fetal RBCs,and fetus become anemic,The anemic fetus starts to release many immature erythroblasts into his blood stream.That is why this hemolytic diseases of new borne is called erythroblastosis foetalis.
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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 erythroblastosis foetalis?

  • Ans 1: Due to maternal-fetal Rh incompatibility,there is destruction of fetal RBCs,and fetus become anemic,The anemic fetus starts to release many immature erythroblasts into his blood stream.That is why this hemolytic diseases of new borne is called erythroblastosis foetalis.
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12th Class Biology Chapter 22 Short Questions Preparation - Set 2

Question # 1

What is tetrad?

  • Ans 1: Each pair of homologous chromosome which consists of four chromatids is called tetrad.
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12th Class Biology Chapter 22 Short Questions Preparation - Set 3

Question # 1

Differentiate between multiple alleles and polygenes..

  • Ans 1: Multiple alleles: If a gene has more than two alternate forms these are called multiple alleles.For example alleles for ABO blood group. E.g,alleles for ABO blood group.
  • Ans 2: Polygenes: When a continuously varying trait is controlled by alleles for two or more than two different gene pairs found at different loci,all influencing the same trait in an additive way,such genes are called polygenes, e.g,genes for controlling skin and eye colour in human.
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12th Class Biology Chapter 22 Short Questions Preparation - Set 4

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 5

Question # 1

how can you calculate frequency between two linked genes?

  • Ans 1: Frequency between two linked genes can be calculated by the following formula
    Recombination frequency=Recombination type
    --------------------------* 100
    Sum of all combinations
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12th Class Biology Chapter 22 Short Questions Preparation - Set 6

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

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