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 XO-XX mechanism of sex determination?

  • Ans 1: This pattern of Inheritance is found in grasshopper and protenor bug.Male is XO because male has one x chromosomes,the other x chromosomes is missing and female is xx,it is homogametic because it forms all gametes of same type with one X chromosome.Male is heterogametic because it forms two types sperms: half sperms have X chromosomes and other half are without X chromosomes.
    When sperm with X chromosomes is fused with an egg having X chromosomes female offspring is produced and when sperms without X chromosomes is fused with egg then male offspring will be produced.
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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 XO-XX mechanism of sex determination?

  • Ans 1: This pattern of Inheritance is found in grasshopper and protenor bug.Male is XO because male has one x chromosomes,the other x chromosomes is missing and female is xx,it is homogametic because it forms all gametes of same type with one X chromosome.Male is heterogametic because it forms two types sperms: half sperms have X chromosomes and other half are without X chromosomes.
    When sperm with X chromosomes is fused with an egg having X chromosomes female offspring is produced and when sperms without X chromosomes is fused with egg then male offspring will be produced.
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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

Define linkage and give its one disadvantage.

  • Ans 1: Phenomenon of staying together of all the genes of a chromosomes is called linkage.
    Its disadvantage is that,alleles cannot be assorted independently and no new recombinations are formed.

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12th Class Biology Chapter 22 Short Questions Preparation - Set 4

Question # 1

Differentiate between autosome and sex chromosomes.

  • Ans 1: Autosome chromosomes: Chromosomes which do not contain genes for sex determination or chromosomes other than sex chromosomes are called autosomes.
  • Ans 2: Sex chromosomes: Chromosomes which play role in sex determination are called sex chromosomes.
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12th Class Biology Chapter 22 Short Questions Preparation - Set 5

Question # 1

What do you know about co-dominance?

  • Ans 1: Different alleles of a gene that are both expressed in a heterozygous condition is called co-dominance.
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12th Class Biology Chapter 22 Short Questions Preparation - Set 6

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

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