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 test cross?Who devised it?

  • Ans 1: Mendel devised test cross.
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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 test cross?Who devised it?

  • Ans 1: Mendel devised test cross.
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12th Class Biology Chapter 22 Short Questions Preparation - Set 2

Question # 1

What is nullo gametes?

  • Ans 1: A gamete without sex chromosomes is called nullo gamete.For Example Grasshopper male produce 50% nullo gametes and 50% with sex chromosomes.
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12th Class Biology Chapter 22 Short Questions Preparation - Set 3

Question # 1

What is Mody?Write its causes.

  • Ans 1: About 2 to 5% of type II diabetics get the disease early in the life before 25 year of age.It is called maturity onset diabetes of the young(Mody).Mody can be inherited as an autosomal dominant trait.
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12th Class Biology Chapter 22 Short Questions Preparation - Set 4

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 5

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 Preparation - Set 6

Question # 1

What is heterogametic individual?Give example.

  • Ans 1: Male grasshopper is XO because it has only one X chromosome.The other sex chromosome is missing entirely.Male is heterogametic because it forms two type of sperms,half the sperms have X chromosome while the other half are without any sex chromosome.
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12th Class Biology Chapter 22 Short Questions

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