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

Give significance of test cross.

  • Ans 1: Mendel devised a cross called test cross,which is used to test the genotype of an individual showing a dominant phenotype.This cross finds out the homozygous or heterozygous nature of the genotype.
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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

Give significance of test cross.

  • Ans 1: Mendel devised a cross called test cross,which is used to test the genotype of an individual showing a dominant phenotype.This cross finds out the homozygous or heterozygous nature of the genotype.
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12th Class Biology Chapter 22 Short Questions Preparation - Set 2

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 3

Question # 1

How sex is determined in plants?

  • Ans 1: Plants show a variety of sexual situations.Some species like Ginkgo are dio-ecious having plants of separate sexes.Male plants produce flower with only stamens and female plants produce flower with only carpels.Some dioecious plants have a difference of sex chromosome between the sexes.These have an X-Y system.These plants typically exhibit an X-choromosome autosome balance system for sex determination.
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12th Class Biology Chapter 22 Short Questions Preparation - Set 4

Question # 1

What is a true breeding variety?

  • Ans 1: A true breeding variety upon self fertilization always produced offsprings identical to their parents.
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12th Class Biology Chapter 22 Short Questions Preparation - Set 5

Question # 1

Compare between epistasis and poleiotropy.

  • Ans 1: Epistasis: When an effect caused by a gene pair on one locus interferes with or hides the effect caused by another gene or gene pair at another locus,it is called epistasis.
  • Ans 2: Poleiotropy: When a single gene affects two of more traits,the phenomenon is called pleiotropy.
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12th Class Biology Chapter 22 Short Questions Preparation - Set 6

Question # 1

Differentiate between genotype and phenotype.

  • Ans 1: Genotype: Genotype is the genetic complement i.e the genes is an individual for a particular trait e.g"Rr" &"Rr" are alleles for red color."rr" are alleles for white colour.
  • Ans 2: Phenotype:"Phenotype" is the from of appearance of a trait in an organism".e.g Red and white flower colours are example of phenotype.
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12th Class Biology Chapter 22 Short Questions

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