Get the 12th Class Fsc Biology Online Preparation for chapter 22 (Variation and Genetics)

Question # 1

What is epistasis?Ho it differs from dominance?

Ans 1: Epistasis: An effect caused by a gene or gene pair at one locus interferes with or hides the effect caused by another gene or gene pair at another locus,such a phenomenon of gene interaction is called epistasis.
Epistasis must not be confused with dominance.
Ans 2: Dominance: Dominance is the relationship between alleles of the same gene occupying the same locus,but epistasis is the interaction between different genes occupying different loci.

Question # 2

Differentiate between tritanopia and deutranopia.

Ans 1: Tritanopia: Tritanopia is blue colour blindness.
Ans 2: Deuteranopia: Deuteronopia is green blindness.

Question # 3

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.

Question # 4

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.

Question # 5

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.

Question # 6

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.

Question # 7

What is type II diabetes or NIDDM?

Ans 1: Type II diabetes or NIDDM.It account for 90% of all diabetic patients.These person produce some endogenous insulin themselves,but their body cells fail to respond to insulin and cannot take up glucose from body.They develop some sort of insulin resistance.

Question # 8

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.

Question # 9

Differentiate between homogametic and heterogametic organism.

Ans 1: Homogametic organism: When an organism produce all the gametes of same type it is called homogametic.
Ans 2: Heterogametic organism:If an organism produce gametes of different type it is called heterogametic.

Question # 10

Differentiate between continuous and discontinuous variations.

Ans 1: Continuous variations: In Continuous variations many intermediate forms of a trait are present and organism show very small difference for a trait.For example skin color,eye color.
Ans 2: Discontinuous variations: In discontinuous variations very sharp difference is present and no intermediate forms are present for a trait.For example tongue rolling,attached or free pinna.

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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 "

Biology - 12th Class Biology Chapter 22 Short Questions Preparation

What is epistasis?Ho it differs from dominance?

Differentiate between tritanopia and deutranopia.

What are sex influenced traits?Give an example.

Differentiate between multifactorial and polygenic traits.

Differentiate between genotype and phenotype.

Differentiate between co-dominance and over dominance.

What is type II diabetes or NIDDM?

Give significance of test cross.

Differentiate between homogametic and heterogametic organism.

Differentiate between continuous and discontinuous variations.

Prepare Complete Set Wise Questions For Chapter 8 "12th Class Biology Chapter 22 Short Questions Preparation "

Set 1

Set 2

Set 3

Set 4

Set 5

Set 6

12th Class Biology Chapter 22 Short Questions Preparation - Set 1

What is epistasis?Ho it differs from dominance?

Differentiate between tritanopia and deutranopia.

What are sex influenced traits?Give an example.

Differentiate between multifactorial and polygenic traits.

Differentiate between genotype and phenotype.

Differentiate between co-dominance and over dominance.

What is type II diabetes or NIDDM?

Give significance of test cross.

Differentiate between homogametic and heterogametic organism.

Differentiate between continuous and discontinuous variations.

12th Class Biology Chapter 22 Short Questions Preparation - Set 2

Define co-dominance.

What is tetrad?

Differentiate between monohybrid and dihybrid cross.

What do you known about protanopia and tritanopia?

Define linkage and give its one disadvantage.

Differentiate between quantitative and qualitative variations.

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

Define incomplete dominance,Give example

Define polygenic Inheritance.Give example.

What is Pleiotropy? Give one example.

12th Class Biology Chapter 22 Short Questions Preparation - Set 3

What is tetrad?

What is law of segregation?

Define gene and locus.

How sex is determined in plants?

What are jumping genes?

How does ABO incompatibility protect the developing baby against Rh-

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

What is test cross?Who devised it?

Differentiate between monohybrid and dihybrid cross.

What is XO-XX mechanism of sex determination?

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

What do you known about protanopia and tritanopia?

What are jumping genes?

Define incomplete dominance,Give example

Why is blood group AB called as universal recipient?

Define polygenic Inheritance.Give example.

Differentiate between continuous and discontinuous variations.

Define gene and locus.

What is test cross? Give its significance?

Differentiate between co-dominance and over dominance.

What is test cross?Who devised it?

12th Class Biology Chapter 22 Short Questions Preparation - Set 5

What is heterogametic individual?Give example.

Differentiate between monohybrid and dihybrid cross.

What are multiple alleles,give its example?

Why is blood group AB called as universal recipient?

What is Mody?Write its causes.

What is contribution of Carl Correns in genetics?

Differentiate between autosome and sex chromosomes.

Differentiate between population & gene pool.