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

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 # 3

Differentiate between dominant and recessive traits.

Ans 1: Dominant trait: They trait which is controlled by dominant gene or allele us called dominant trait.
Ans 2: Recessive trait: The trait which is controlled by recessive gene or allele is called recessive trait.

Question # 4

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 # 5

What is type II diabetes or NIDDM?

Ans 1: Type II diabetes or NIDDM.It account for 90% of all diabetic patients.These person produce some endogenous insulin themselves,but their body cells fail to respond to insulin and cannot take up glucose from body.They develop some sort of insulin resistance.

Question # 6

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 # 7

What is Pleiotropy? Give one example.

Ans 1: When a single gene affects two or more traits the phenomenon is called pleiotropy. E.g, genes that effect growth rate in human also influence both weight and height.

Question # 8

What are sex influenced traits?Give an example.

Ans 1: Sex influencing traits occurs in both males and females but more common in one sex.It is controlled by an allele that is dominant in one sex but recessive in other.The difference in expression is due hormonal difference in two sexes.E.g, patteren baldness is sex influenced trait.

Question # 9

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 # 10

What is beanbag genetics? Explain.

Ans 1: Beanbag genetics means that alleles are like a bean bag.The entire bean bag full of beans is the gene of the population.In the bean bag approach we can imagine the entire gene pool comprising all the alleles for all different traits at once,or we can just focus on some subset,such as all the alleles for a single trait

Latest Educational News Stories

Pakistan's Largest Database of Colleges and Universities

BS Programs

University Past Papers

University Results

Exam Results 2024

Study Abroad Programs and Opportunities for Pakistani Students

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?

Define gene and locus.

Differentiate between dominant and recessive traits.

Differentiate between co-dominance and over dominance.

What is type II diabetes or NIDDM?

Define linkage and give its one disadvantage.

What is Pleiotropy? Give one example.

What are sex influenced traits?Give an example.

How sex is determined in yeast?

What is beanbag genetics? Explain.

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?

Define gene and locus.

Differentiate between dominant and recessive traits.

Differentiate between co-dominance and over dominance.

What is type II diabetes or NIDDM?

Define linkage and give its one disadvantage.

What is Pleiotropy? Give one example.

What are sex influenced traits?Give an example.

How sex is determined in yeast?

What is beanbag genetics? Explain.

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

What is heterogametic individual?Give example.

What are sex limited traits?Give an example.

Define linkage and give its one disadvantage.

What is haemophillia?Give its type.

What is XO-XX mechanism of sex determination?

What is type II diabetes or NIDDM?

Explain genic system for determination of sex.

Differentiate between co-dominance and over dominance.

What is contribution of Carl Correns in genetics?

What is Pleiotropy? Give one example.

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

Differentiate between dominant and recessive traits.

Differentiate between multiple alleles and polygenes..

What is tetrad?

What do you known about protanopia and tritanopia?

What is type II diabetes or NIDDM?

In bird's the female is heterogametic. How?

What is hypophosphatemic rickets?

What is nullo gametes?

Give significance of test cross.

Define crossing over.Give its importance.

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

What are multiple alleles,give its example?

What is Mody?Write its causes.

Define pleiotropy. Give two examples.

What is beanbag genetics? Explain.

What is erythroblastosis foetalis?

What is test cross?Who devised it?

Explain testicular feminization syndrome.

Differentiate between genotype and phenotype.

What is dominance?Discuss over dominance.

Define product rule and pseudoautosomal genes.

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

What are multiple alleles,give its example?

What are jumping genes?

What is dominance?Discuss over dominance.

Define co-dominance.

How does ABO incompatibility protect the developing baby against Rh-

Explain genic system for determination of sex.

Differentiate between monohybrid and dihybrid cross.

What is nullo gametes?