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

Question # 1

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 # 2

What is haemophillia?Give its type.

Ans 1: Haemophilia is rare x-linked recessive trait.Haemophilic's blood does not clot properly after an injury,because it has either a reduction or malfunction or complete absence of blood clotting factor.
It types are Haemophilia A,haemophilia B and haemophila C.

Question # 3

In bird's the female is heterogametic. How?

Ans 1: In birds female is heterogametic because she produce two different types of gametes and sex of new borne is determined by the type of female gamete which fertilize the sperm.

Question # 4

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 # 5

What are jumping genes?

Ans 1: Jumping genes do not reside peacefully on their loci; they keep on hopping on different loci on the same chromosomes or other chromosomes.

Question # 6

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 # 7

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 # 8

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 # 9

Explain testicular feminization syndrome.

Ans 1: Testicular feminization syndrome is a rare X linked recessive trait.Although the persons affected by this trait have a set of XY chromosome.Yet tfm gene on their X chromosome develops them physically into females.They have breast,female genitalia a blind vagina but no uterus,degenerated testis are also present in abdomen.Such individuals are happily married as female but are sterile.it is an androgen insensitivity syndrome.Male sex hormone testoterone has no effect on them.

Question # 10

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.

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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

How sex is determined in yeast?

What is haemophillia?Give its type.

In bird's the female is heterogametic. How?

What is test cross? Give its significance?

What are jumping genes?

Differentiate between continuous and discontinuous variations.

Differentiate between quantitative and qualitative variations.

Differentiate between genotype and phenotype.

Explain testicular feminization syndrome.

What is the product rule?

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

How sex is determined in yeast?

What is haemophillia?Give its type.

In bird's the female is heterogametic. How?

What is test cross? Give its significance?

What are jumping genes?

Differentiate between continuous and discontinuous variations.

Differentiate between quantitative and qualitative variations.

Differentiate between genotype and phenotype.

Explain testicular feminization syndrome.

What is the product rule?

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

Differentiate between quantitative and qualitative variations.

Differentiate between population & gene pool.

Define linkage and give its one disadvantage.

Define co-dominance.

What is monochromacy?

What is epistasis?Ho it differs from dominance?

What is haemophillia?Give its type.

Differentiate between multifactorial and polygenic traits.

Compare between epistasis and poleiotropy.

What is tetrad?

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

Why is blood group AB called as universal recipient?

Differentiate between population & gene pool.

In bird's the female is heterogametic. How?

What is type II diabetes or NIDDM?

What is law of segregation?

What do you known about protanopia and tritanopia?

Differentiate between multiple alleles and polygenes..

What is Bombay Phenotype?

Differentiate between autosome and sex chromosomes.

What is test cross? Give its significance?

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

What is the product rule?

What is Bombay Phenotype?

What are jumping genes?

What is type II diabetes or NIDDM?

What is hypophosphatemic rickets?

What is law of segregation?

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

How sex is determined in yeast?

Differentiate between co-dominance and over dominance.

Explain gene and allele.

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

Differentiate between homogametic and heterogametic organism.

State Law of independent assortment.

What is XO-XX mechanism of sex determination?

Why is blood group AB called as universal recipient?

What is Mody?Write its causes.

What is heterogametic individual?Give example.

How sex is determined in yeast?

In bird's the female is heterogametic. How?