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

Question # 1

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 # 2

What is erythroblastosis foetalis?

Ans 1: Due to maternal-fetal Rh incompatibility,there is destruction of fetal RBCs,and fetus become anemic,The anemic fetus starts to release many immature erythroblasts into his blood stream.That is why this hemolytic diseases of new borne is called erythroblastosis foetalis.

Question # 3

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 # 4

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 # 5

What is a true breeding variety?

Ans 1: A true breeding variety upon self fertilization always produced offsprings identical to their parents.

Question # 6

Define product rule and pseudoautosomal genes.

Ans 1: The genes which are located both on x and y chromosomes are called x and y linked genes or pseudoautosomal genes because their pattern of inheritance is like autosomal genes.
Ans 2: Product rule: When we multiply probabilities of two different event,this phenomenon is called product rule.

Question # 7

Differentiate between linkage and linkage group.

Ans 1: Linkage: linkage is a phenomenon in which all the genes on a chromosomes stay together is called linkage.
Ans 2: Linkage group: The genes which are present on a chromosome from a block and these genes atay together is called linkage group.

Question # 8

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 # 9

Differentiate between population & gene pool.

Ans 1: Population: Any group of interbreeding organisms of the same species that exist together in both time and space is called a population.e.g 100 diploid plants of pea in a field is an example of population.
Ans 2: Gene pool: All the genes or alleles found in a breeding population at a given time are collectively called the gene pool.e.g pea plants has white colors.There will be 100 genes(or 200 alleles) for flower color in gene pool.

Question # 10

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.

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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

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

What is erythroblastosis foetalis?

Differentiate between multiple alleles and polygenes..

How does ABO incompatibility protect the developing baby against Rh-

What is a true breeding variety?

Define product rule and pseudoautosomal genes.

Differentiate between linkage and linkage group.

Differentiate between gene and allele.

Differentiate between population & gene pool.

Define incomplete dominance,Give example

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

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

What is erythroblastosis foetalis?

Differentiate between multiple alleles and polygenes..

How does ABO incompatibility protect the developing baby against Rh-

What is a true breeding variety?

Define product rule and pseudoautosomal genes.

Differentiate between linkage and linkage group.

Differentiate between gene and allele.

Differentiate between population & gene pool.

Define incomplete dominance,Give example

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

What is type II diabetes or NIDDM?

Define SRY gene.

Explain testicular feminization syndrome.

What is heterogametic individual?Give example.

What do you known about protanopia and tritanopia?

What is test cross? Give its significance?

Differentiate between quantitative and qualitative variations.

Define gene and locus.

What is hypophosphatemic rickets?

What is nullo gametes?

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

What is erythroblastosis foetalis?

What is Bombay Phenotype?

What are multiple alleles,give its example?

What is Mody?Write its causes.

What is hypophosphatemic rickets?

What do you know about co-dominance?

Give significance of test cross.

Differentiate between linkage and linkage group.

Define pleiotropy. Give two examples.

Differentiate between multiple alleles and polygenes..

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

Differentiate between population & gene pool.

Explain testicular feminization syndrome.

Define SRY gene.

What is law of segregation?

Define incomplete dominance,Give example

What is tetrad?

Differentiate between multifactorial and polygenic traits.

In bird's the female is heterogametic. How?

What are jumping genes?

What are sex influenced traits?Give an example.

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

Differentiate between autosome and sex chromosomes.

What is test cross? Give its significance?

Differentiate between co-dominance and over dominance.

What do you know about co-dominance?

Compare between epistasis and poleiotropy.

Differentiate between genotype and phenotype.

What are sex limited traits?Give an example.

How sex is determined in yeast?