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

Question # 1

Define incomplete dominance,Give example

Ans 1: When the phenotype of the heterozygote is intermediate between phenotypes of the two homozygotes,it is called incomplete dominance.
Example: flower colouring in 4'0 clock plant.

Question # 2

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.

Question # 3

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 # 4

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.}

Question # 5

Differentiate between monohybrid and dihybrid cross.

Ans 1: Monohybrid: A cross between two organisms which differ only in one character is called monohybrid cross.
Ans 2: Dihybrid: A cross between two organisms which differ only in two character is called dihybrid.

Question # 6

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.

Question # 7

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 # 8

how can you calculate frequency between two linked genes?

Ans 1: Frequency between two linked genes can be calculated by the following formula
Recombination frequency=Recombination type
--------------------------* 100
Sum of all combinations

Question # 9

Differentiate between homozygous and heterozygous.

Ans 1: Homozygous: If alleles of a gene pair are in similar from they are called homozygous.
Ans 2: Heterozygous: If the alleles of a gene pair are in different from they are called heterozygous.

Question # 10

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.

Latest Educational News Stories

Pakistan's Largest Database of Colleges and Universities

BS Programs

University Past Papers

University Results

Exam Results 2024

Study Abroad Programs and Opportunities for Pakistani Students

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

Define incomplete dominance,Give example

Differentiate between quantitative and qualitative variations.

Differentiate between genotype and phenotype.

What is dominance?Discuss over dominance.

Differentiate between monohybrid and dihybrid cross.

Differentiate between dominant and recessive traits.

Differentiate between multifactorial and polygenic traits.

how can you calculate frequency between two linked genes?

Differentiate between homozygous and heterozygous.

Differentiate between co-dominance and over dominance.

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

Define incomplete dominance,Give example

Differentiate between quantitative and qualitative variations.

Differentiate between genotype and phenotype.

What is dominance?Discuss over dominance.

Differentiate between monohybrid and dihybrid cross.

Differentiate between dominant and recessive traits.

Differentiate between multifactorial and polygenic traits.

how can you calculate frequency between two linked genes?

Differentiate between homozygous and heterozygous.

Differentiate between co-dominance and over dominance.

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

Explain testicular feminization syndrome.

What is Bombay Phenotype?

In bird's the female is heterogametic. How?

What is law of segregation?

What is beanbag genetics? Explain.

Give significance of test cross.

What is haemophillia?Give its type.

Differentiate between homozygous and heterozygous.

How sex is determined in yeast?

What do you known about protanopia and tritanopia?

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

Differentiate between quantitative and qualitative variations.

how can you calculate frequency between two linked genes?

What is nullo gametes?

Differentiate between multifactorial and polygenic traits.

Define recombination frequency.Give an example.

What are multiple alleles,give its example?

What is beanbag genetics? Explain.

What is contribution of Carl Correns in genetics?

Differentiate between homogametic and heterogametic organism.

Give significance of test cross.

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

What are sex influenced traits?Give an example.

Differentiate between continuous and discontinuous variations.

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

What is heterogametic individual?Give example.

Define pleiotropy. Give two examples.

Differentiate between autosome and sex chromosomes.

What do you known about protanopia and tritanopia?

What are sex limited traits?Give an example.

Define co-dominance.

What do you know about co-dominance?

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

What are sex influenced traits?Give an example.

What is nullo gametes?

Differentiate between co-dominance and over dominance.

What do you known about protanopia and tritanopia?

What is a true breeding variety?

Define crossing over.Give its importance.

Differentiate between dominant and recessive traits.

Define co-dominance.