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

Question # 1

What do you know about co-dominance?

Ans 1: Different alleles of a gene that are both expressed in a heterozygous condition is called co-dominance.

Question # 2

How does ABO incompatibility protect the developing baby against Rh-

Ans 1: Incompatiability
Rh sensitization of Rh mother can be easily avoided If mother is given an injection of Rh antiserum during early pregnancy and immediately after birth.

Question # 3

Define crossing over.Give its importance.

Ans 1: Mendel devised a cross called test cross,which is used to test the genotype of an individual showing a dominant phenotype.It is a mating in which an individual showing a dominant phenotype is crossed with an individual showing its recessive phenotype.significance of test cross is it is used to check the homozygosity & heterozygosity of the dominant parent.

Question # 4

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 # 5

Differentiate between multiple alleles and polygenes..

Ans 1: Multiple alleles: If a gene has more than two alternate forms these are called multiple alleles.For example alleles for ABO blood group. E.g,alleles for ABO blood group.
Ans 2: Polygenes: When a continuously varying trait is controlled by alleles for two or more than two different gene pairs found at different loci,all influencing the same trait in an additive way,such genes are called polygenes, e.g,genes for controlling skin and eye colour in human.

Question # 6

Define gene and locus.

Ans 1: Gene is unit of inheritance. Or it may be defined as
Ans 2: The sequence of nucleotides which determines the amino acid sequence of a protein is called gene and the position of a gene on the chromosomes is known as locus.

Question # 7

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 # 8

What is contribution of Carl Correns in genetics?

Ans 1: Carl Correns discovered the phenomenon of incomplete dominance.
He crossed red flowered 4 O clock plant with while flowered 4 O clock plant.In f₁pink flowers were produced instead of red color was dominant.He again crossed pink flowers from F_1,in F₂red,pink white flowers obtained with ratio 1:2:1 respectively.

Question # 9

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 # 10

What is tetrad?

Ans 1: Each pair of homologous chromosome which consists of four chromatids is called tetrad.

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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 do you know about co-dominance?

How does ABO incompatibility protect the developing baby against Rh-

Define crossing over.Give its importance.

Differentiate between quantitative and qualitative variations.

Differentiate between multiple alleles and polygenes..

Define gene and locus.

Differentiate between homogametic and heterogametic organism.

What is contribution of Carl Correns in genetics?

Differentiate between continuous and discontinuous variations.

What is tetrad?

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 do you know about co-dominance?

How does ABO incompatibility protect the developing baby against Rh-

Define crossing over.Give its importance.

Differentiate between quantitative and qualitative variations.

Differentiate between multiple alleles and polygenes..

Define gene and locus.

Differentiate between homogametic and heterogametic organism.

What is contribution of Carl Correns in genetics?

Differentiate between continuous and discontinuous variations.

What is tetrad?

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

Define gene and locus.

What is the product rule?

What are multiple alleles,give its example?

What is heterogametic individual?Give example.

What is a true breeding variety?

What do you known about protanopia and tritanopia?

Define incomplete dominance,Give example

What is monochromacy?

What is contribution of Carl Correns in genetics?

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

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

Differentiate between homozygous and heterozygous.

What is test cross? Give its significance?

Define pleiotropy. Give two examples.

What is Pleiotropy? Give one example.

What is a true breeding variety?

What is heterogametic individual?Give example.

Define probability.

Define gene and locus.

What are jumping genes?

Differentiate between population & gene pool.

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

Differentiate between homozygous and heterozygous.

What is Pleiotropy? Give one example.

Define recombination frequency.Give an example.

What is contribution of Carl Correns in genetics?

What do you known about protanopia and tritanopia?

What is type II diabetes or NIDDM?

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.

What is beanbag genetics? Explain.

Differentiate between multiple alleles and polygenes..

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

State Law of independent assortment.

What is the product rule?

What is Mody?Write its causes.

Define incomplete dominance,Give example

What is tetrad?

Differentiate between monohybrid and dihybrid cross.

How sex is determined in plants?

Define product rule and pseudoautosomal genes.