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

Question # 1

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 # 2

What is Mody?Write its causes.

Ans 1: About 2 to 5% of type II diabetics get the disease early in the life before 25 year of age.It is called maturity onset diabetes of the young(Mody).Mody can be inherited as an autosomal dominant trait.

Question # 3

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 # 4

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 # 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

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 # 7

State Law of independent assortment.

Ans 1: When two contrasting pairs of traits are followed in the same cross,their alleles are assorted independently into gametes.

Question # 8

Compare between epistasis and poleiotropy.

Ans 1: Epistasis: When an effect caused by a gene pair on one locus interferes with or hides the effect caused by another gene or gene pair at another locus,it is called epistasis.
Ans 2: Poleiotropy: When a single gene affects two of more traits,the phenomenon is called pleiotropy.

Question # 9

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 # 10

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.

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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 the product rule?

What is Mody?Write its causes.

Define gene and locus.

Define crossing over.Give its importance.

Differentiate between multiple alleles and polygenes..

What is contribution of Carl Correns in genetics?

State Law of independent assortment.

Compare between epistasis and poleiotropy.

How does ABO incompatibility protect the developing baby against Rh-

Differentiate between monohybrid and dihybrid cross.

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 the product rule?

What is Mody?Write its causes.

Define gene and locus.

Define crossing over.Give its importance.

Differentiate between multiple alleles and polygenes..

What is contribution of Carl Correns in genetics?

State Law of independent assortment.

Compare between epistasis and poleiotropy.

How does ABO incompatibility protect the developing baby against Rh-

Differentiate between monohybrid and dihybrid cross.

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

Define crossing over.Give its importance.

How does ABO incompatibility protect the developing baby against Rh-

How sex is determined in yeast?

What is tetrad?

What do you know about co-dominance?

What is Mody?Write its causes.

Differentiate between multiple alleles and polygenes..

how can you calculate frequency between two linked genes?

Define gene and locus.

Define incomplete dominance,Give example

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

What is hypophosphatemic rickets?

Define probability.

What is haemophillia?Give its type.

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

how can you calculate frequency between two linked genes?

What is epistasis?Ho it differs from dominance?

What do you know about co-dominance?

Define SRY gene.

Define gene linkage and gene linkage groups.

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

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

What are jumping genes?

What is law of segregation?

What is heterogametic individual?Give example.

Differentiate between continuous and discontinuous variations.

What is Bombay Phenotype?

What is nullo gametes?

Define gene linkage and gene linkage groups.

Why is blood group AB called as universal recipient?

Explain gene and allele.

What is erythroblastosis foetalis?

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

What is the product rule?

Give significance of test cross.

Define probability.

State Law of independent assortment.

Differentiate between dominant and recessive traits.

Differentiate between gene and allele.

How does ABO incompatibility protect the developing baby against Rh-

What do you know about co-dominance?