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

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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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

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 Preparation - Set 2

Question # 1

Differentiate between co-dominance and over dominance.

  • Ans 1: Co-dominance: Different alleles of a gene that are both expressed in a heterozygous condition are called codominant and this phenomenon is called codominance.e.g if a man of M blood group marries a woman of N blood group,all their children will have MN blood group.
  • Ans 2: Over-dominance: This dominance relation is fascinating because the overdominant heterozygote exceeds in quantity the phenotypic expression of both the homozygotes.e.g In fruit fly Drosophila the heterozygote W+/W or white eye w/w homozygotes.
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12th Class Biology Chapter 22 Short Questions Preparation - Set 3

Question # 1

Explain gene and allele.

  • Ans 1: Gene is a part a DNA which can provide instruction for the synthesis of a protein.It is unit of inheritance.
  • Ans 2: Allele is an alternate from of gene.
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12th Class Biology Chapter 22 Short Questions Preparation - Set 4

Question # 1

Define co-dominance.

  • Ans 1: Different alleles of a gene that are both expressed in a heterozygous condition are called co-dominance e.g MN blood group system.
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12th Class Biology Chapter 22 Short Questions Preparation - Set 5

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 6

Question # 1

Differentiate between quantitative and qualitative variations.

  • Ans 1: Quantitative variations: In Qualitative variations difference is small and less striking.Many traits like skin color,height and weight exhibit continuous quantitative variation.
  • Ans 2: Qualitative variations: In qualitative variations differences are large and more obvious,some traits like pea seed shape show discontinuous qualitative variations with two sharply distinct phenotypes like round and wrinkled.
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22th Chapter

12th Class Biology Chapter 22 Short Questions

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