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

  • Total Questions10

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Biology - 12th Class Biology Chapter 22 Short Questions Preparation

Question # 1

Explain genic system for determination of sex.

  • Ans 1: Many species of eukaryotic micro-organisms like yeast do not have sex chromosomes.These depend on genic system for determination of sex.In this system the sexes are specified by simple allelic differences at small number of gene loci.
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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

Explain genic system for determination of sex.

  • Ans 1: Many species of eukaryotic micro-organisms like yeast do not have sex chromosomes.These depend on genic system for determination of sex.In this system the sexes are specified by simple allelic differences at small number of gene loci.
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12th Class Biology Chapter 22 Short Questions Preparation - Set 2

Question # 1

Define recombination frequency.Give an example.

  • Ans 1: It is the proportion of recombinant type between two gene pairs as compared to sum of all combinations.
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12th Class Biology Chapter 22 Short Questions Preparation - Set 3

Question # 1

Define crossing over.Give its importance.

  • Ans 1: Mendel devised a cross called test cross,which is used to test the genotype of an individual showing a dominant phenotype.It is a mating in which an individual showing a dominant phenotype is crossed with an individual showing its recessive phenotype.significance of test cross is it is used to check the homozygosity & heterozygosity of the dominant parent.
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12th Class Biology Chapter 22 Short Questions Preparation - Set 4

Question # 1

Differentiate between multifactorial and polygenic traits.

  • Ans 1: Multifactorial traits: Traits which are controlled by many genes (polygenes) with combination of environment are called multifactorial traits.
  • Ans 2: Polygenic Inheritance: The quantitive are called polygenic traits.These traits are controlled by more than two pairs of genes.Each polygene has small positive or negative effect on characters.
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12th Class Biology Chapter 22 Short Questions Preparation - Set 5

Question # 1

Differentiate between gene and allele.

  • Ans 1: Gene: Gene is the basic unit of biological information.In fact DNA allstorts of biological information coded in the sequence of its bases in a linear order and genes are actually parts of DNA comprising its base sequences.
  • Ans 2: Allele: Genes form pairs on pairs of homologous chromosomes.One member of a gene pair is located on one homologue and the other homologue and the other member on the other homologue partners of a gene pair are called alleles.
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12th Class Biology Chapter 22 Short Questions Preparation - Set 6

Question # 1

Two Normal parents have an albino child.What is the probability that their next child will also be an albino?

  • Ans 1: 3 of their sons will be normal and one will be albino that is the ratio is
    Normal : Albino
    3 1
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22th Chapter

12th Class Biology Chapter 22 Short Questions

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