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

Question # 1

Define linkage and give its one disadvantage.

Ans 1: Phenomenon of staying together of all the genes of a chromosomes is called linkage.
Its disadvantage is that,alleles cannot be assorted independently and no new recombinations are formed.

Question # 2

What do you known about protanopia and tritanopia?

Ans 1: Protonopia is red colour blindness while tritonopia is blue color blindness.

Question # 3

What is monochromacy?

Ans 1: Monochromacy means only one colour can be perceived by the colour blind person.Monochromacy is true colour blindness.

Question # 4

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 # 5

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.

Question # 6

What is test cross? Give its significance?

Ans 1: Test cross is a cross used to test the genotype of an organism showing dominant phenotype.
Significance of test cross is that we can know the genotype of an organism

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 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 # 10

What is XO-XX mechanism of sex determination?

Ans 1: This pattern of Inheritance is found in grasshopper and protenor bug.Male is XO because male has one x chromosomes,the other x chromosomes is missing and female is xx,it is homogametic because it forms all gametes of same type with one X chromosome.Male is heterogametic because it forms two types sperms: half sperms have X chromosomes and other half are without X chromosomes.
When sperm with X chromosomes is fused with an egg having X chromosomes female offspring is produced and when sperms without X chromosomes is fused with egg then male offspring will be produced.

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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

Define linkage and give its one disadvantage.

What do you known about protanopia and tritanopia?

What is monochromacy?

Differentiate between genotype and phenotype.

Differentiate between gene and allele.

What is test cross? Give its significance?

Differentiate between multifactorial and polygenic traits.

how can you calculate frequency between two linked genes?

Differentiate between monohybrid and dihybrid cross.

What is XO-XX mechanism of sex determination?

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 linkage and give its one disadvantage.

What do you known about protanopia and tritanopia?

What is monochromacy?

Differentiate between genotype and phenotype.

Differentiate between gene and allele.

What is test cross? Give its significance?

Differentiate between multifactorial and polygenic traits.

how can you calculate frequency between two linked genes?

Differentiate between monohybrid and dihybrid cross.

What is XO-XX mechanism of sex determination?

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

In bird's the female is heterogametic. How?

What is the product rule?

Differentiate between continuous and discontinuous variations.

Differentiate between autosome and sex chromosomes.

What is hypophosphatemic rickets?

Differentiate between tritanopia and deutranopia.

Define polygenic Inheritance.Give example.

Differentiate between gene and allele.

State Law of independent assortment.

What is haemophillia?Give its type.

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

Define pleiotropy. Give two examples.

What is a true breeding variety?

What is haemophillia?Give its type.

What is beanbag genetics? Explain.

Differentiate between linkage and linkage group.

Define gene linkage and gene linkage groups.

how can you calculate frequency between two linked genes?

How does ABO incompatibility protect the developing baby against Rh-

What is the product rule?

What is dominance?Discuss over dominance.

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

What do you known about protanopia and tritanopia?

Differentiate between co-dominance and over dominance.

What is dominance?Discuss over dominance.

What is type II diabetes or NIDDM?

Differentiate between tritanopia and deutranopia.

Define polygenic Inheritance.Give example.

Define SRY gene.

Differentiate between monohybrid and dihybrid cross.

What is contribution of Carl Correns in genetics?

How does ABO incompatibility protect the developing baby against Rh-

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

What do you know about co-dominance?

What is Mody?Write its causes.

What is epistasis?Ho it differs from dominance?

how can you calculate frequency between two linked genes?

What is dominance?Discuss over dominance.

Define recombination frequency.Give an example.

What is XO-XX mechanism of sex determination?

In bird's the female is heterogametic. How?