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

What is tetrad?

  • Ans 1: Each pair of homologous chromosome which consists of four chromatids is called tetrad.
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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 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 2

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 3

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 4

Question # 1

Define polygenic Inheritance.Give example.

  • Ans 1: Polygenic inheritance is that which is controlled by more than two pairs of gene are called polyegneic traits.For example wheat grain color,human eye and skin color.
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12th Class Biology Chapter 22 Short Questions Preparation - Set 5

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 6

Question # 1

In bird's the female is heterogametic. How?

  • Ans 1: In birds female is heterogametic because she produce two different types of gametes and sex of new borne is determined by the type of female gamete which fertilize the sperm.
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12th Class Biology Chapter 22 Short Questions

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