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

How sex is determined in yeast?

  • Ans 1: Sex determination in yeast depends upon genic system.In this system the sexes are determined by simple allelic difference at a small number of gene loci e.g,a and a are the two mating types or sexes of yeast controlled by MAT a and MAT.a alleles respectively.
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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

How sex is determined in yeast?

  • Ans 1: Sex determination in yeast depends upon genic system.In this system the sexes are determined by simple allelic difference at a small number of gene loci e.g,a and a are the two mating types or sexes of yeast controlled by MAT a and MAT.a alleles respectively.
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12th Class Biology Chapter 22 Short Questions Preparation - Set 2

Question # 1

What are sex influenced traits?Give an example.

  • Ans 1: Sex influencing traits occurs in both males and females but more common in one sex.It is controlled by an allele that is dominant in one sex but recessive in other.The difference in expression is due hormonal difference in two sexes.E.g, patteren baldness is sex influenced trait.
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12th Class Biology Chapter 22 Short Questions Preparation - Set 3

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

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 5

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 6

Question # 1

Differentiate between dominant and recessive traits.

  • Ans 1: Dominant trait: They trait which is controlled by dominant gene or allele us called dominant trait.
  • Ans 2: Recessive trait: The trait which is controlled by recessive gene or allele is called recessive trait.
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12th Class Biology Chapter 22 Short Questions

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