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

Define pleiotropy. Give two examples.

  • Ans 1: When a gene more than one trait it is called pleiotropy. For example gene for eye colour in Drosophila also controls shape of spermathecae.
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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

Define pleiotropy. Give two examples.

  • Ans 1: When a gene more than one trait it is called pleiotropy. For example gene for eye colour in Drosophila also controls shape of spermathecae.
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12th Class Biology Chapter 22 Short Questions Preparation - Set 2

Question # 1

Assign the sex of the human having XO,XXX,XXY and XYY chromosomes.

  • Ans 1: Species XX XY XO XXY
    Human Female Male Male Male
    Drosophila Female Male Female Female
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12th Class Biology Chapter 22 Short Questions Preparation - Set 3

Question # 1

What is Bombay Phenotype?

  • Ans 1: When in an individuals RBCs lack A and B antigens although the do not contain Ia and Ib genes.They are phenotypically like O blood group but are not genotypically like O.Their phenotype is called Bombay phenotype.
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12th Class Biology Chapter 22 Short Questions Preparation - Set 4

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 5

Question # 1

Differentiate between population & gene pool.

  • Ans 1: Population: Any group of interbreeding organisms of the same species that exist together in both time and space is called a population.e.g 100 diploid plants of pea in a field is an example of population.
  • Ans 2: Gene pool: All the genes or alleles found in a breeding population at a given time are collectively called the gene pool.e.g pea plants has white colors.There will be 100 genes(or 200 alleles) for flower color in gene pool.
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12th Class Biology Chapter 22 Short Questions Preparation - Set 6

Question # 1

What is dominance?Discuss over dominance.

  • Ans 1: Dominance is a physiological effect of an allele over its partner allele on the same locus.
    Over dominance: This relation is very interesting because the over dominant heterozygote exceed in quantity than phenotypic expression of both the homozygotes. In fruit fly Drosophila the heterozygote(W+/w) has more quantity of florescent pigments in eyes than wild (w+/w+) or white eye (w/w) homozygote.
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12th Class Biology Chapter 22 Short Questions

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