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

Question # 1

Explain gene and allele.

Ans 1: Gene is a part a DNA which can provide instruction for the synthesis of a protein.It is unit of inheritance.
Ans 2: Allele is an alternate from of gene.

Question # 2

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

Question # 3

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.

Question # 4

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 # 5

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 # 6

What is the product rule?

Ans 1: When two independent events are occurring simultaneously like in dihybrid cross,the ratio of each joint phenotypic combination can be obtained by multiplying the probabilities of individual phenotypes. It is called product rule.

Question # 7

How sex is determined in yeast?

Ans 1: Sex determination in yeast depends upon genic system.In this system the sexes are determined by simple allelic difference at a small number of gene loci e.g,a and a are the two mating types or sexes of yeast controlled by MAT a and MAT.a alleles respectively.

Question # 8

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.

Question # 9

Define polygenic Inheritance.Give example.

Ans 1: Polygenic inheritance is that which is controlled by more than two pairs of gene are called polyegneic traits.For example wheat grain color,human eye and skin color.

Question # 10

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 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

Explain gene and allele.

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

Define pleiotropy. Give two examples.

Differentiate between homozygous and heterozygous.

Differentiate between co-dominance and over dominance.

What is the product rule?

How sex is determined in yeast?

Differentiate between continuous and discontinuous variations.

Define polygenic Inheritance.Give example.

Differentiate between gene and allele.

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

Explain gene and allele.

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

Define pleiotropy. Give two examples.

Differentiate between homozygous and heterozygous.

Differentiate between co-dominance and over dominance.

What is the product rule?

How sex is determined in yeast?

Differentiate between continuous and discontinuous variations.

Define polygenic Inheritance.Give example.

Differentiate between gene and allele.

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

Define incomplete dominance,Give example

How sex is determined in yeast?

What is law of segregation?

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

Define gene linkage and gene linkage groups.

Define polygenic Inheritance.Give example.

Differentiate between population & gene pool.

Differentiate between dominant and recessive traits.

State Law of independent assortment.

What do you known about protanopia and tritanopia?

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

What are sex limited traits?Give an example.

What is a true breeding variety?

What is test cross? Give its significance?

Differentiate between monohybrid and dihybrid cross.

Define polygenic Inheritance.Give example.

Differentiate between gene and allele.

What is beanbag genetics? Explain.

Define probability.

What is nullo gametes?

Define recombination frequency.Give an example.

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

Differentiate between dominant and recessive traits.

What are sex influenced traits?Give an example.

What is type II diabetes or NIDDM?

Compare between epistasis and poleiotropy.

What is nullo gametes?

What is tetrad?

Differentiate between linkage and linkage group.

What is beanbag genetics? Explain.

What is XO-XX mechanism of sex determination?

Differentiate between genotype and phenotype.

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

Explain gene and allele.

What is heterogametic individual?Give example.

What do you known about protanopia and tritanopia?

Differentiate between dominant and recessive traits.

Differentiate between genotype and phenotype.

Define crossing over.Give its importance.

What are sex limited traits?Give an example.

What are sex influenced traits?Give an example.