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

Question # 1

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 # 2

Why is blood group AB called as universal recipient?

Ans 1: AB blood group is called recipient because they have both A and B antigens but no antibodies,so they can easily accept or receive any type of blood group i.e,A,B,AB or O

Question # 3

What is Bombay Phenotype?

Ans 1: When in an individuals RBCs lack A and B antigens although the do not contain I^aand I^bgenes.They are phenotypically like O blood group but are not genotypically like O.Their phenotype is called Bombay phenotype.

Question # 4

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 # 5

Differentiate between autosome and sex chromosomes.

Ans 1: Autosome chromosomes: Chromosomes which do not contain genes for sex determination or chromosomes other than sex chromosomes are called autosomes.
Ans 2: Sex chromosomes: Chromosomes which play role in sex determination are called sex chromosomes.

Question # 6

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 # 7

Explain genic system for determination of sex.

Ans 1: Many species of eukaryotic micro-organisms like yeast do not have sex chromosomes.These depend on genic system for determination of sex.In this system the sexes are specified by simple allelic differences at small number of gene loci.

Question # 8

What is epistasis?Ho it differs from dominance?

Ans 1: Epistasis: An effect caused by a gene or gene pair at one locus interferes with or hides the effect caused by another gene or gene pair at another locus,such a phenomenon of gene interaction is called epistasis.
Epistasis must not be confused with dominance.
Ans 2: Dominance: Dominance is the relationship between alleles of the same gene occupying the same locus,but epistasis is the interaction between different genes occupying different loci.

Question # 9

What is dominance?Discuss over dominance.

Ans 1: Dominance is a physiological effect of an allele over its partner allele on the same locus.
Over dominance: This relation is very interesting because the over dominant heterozygote exceed in quantity than phenotypic expression of both the homozygotes. In fruit fly Drosophila the heterozygote(W⁺/w) has more quantity of florescent pigments in eyes than wild (w⁺/w^{+) or white eye (w/w) homozygote.}

Question # 10

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.

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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

Explain testicular feminization syndrome.

Why is blood group AB called as universal recipient?

What is Bombay Phenotype?

What is contribution of Carl Correns in genetics?

Differentiate between autosome and sex chromosomes.

Differentiate between population & gene pool.

Explain genic system for determination of sex.

What is epistasis?Ho it differs from dominance?

What is dominance?Discuss over dominance.

Differentiate between genotype and phenotype.

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

Explain testicular feminization syndrome.

Why is blood group AB called as universal recipient?

What is Bombay Phenotype?

What is contribution of Carl Correns in genetics?

Differentiate between autosome and sex chromosomes.

Differentiate between population & gene pool.

Explain genic system for determination of sex.

What is epistasis?Ho it differs from dominance?

What is dominance?Discuss over dominance.

Differentiate between genotype and phenotype.

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

Define co-dominance.

How does ABO incompatibility protect the developing baby against Rh-

Define incomplete dominance,Give example

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

Define SRY gene.

What is type II diabetes or NIDDM?

Explain gene and allele.

Differentiate between homozygous and heterozygous.

Differentiate between multiple alleles and polygenes..

What is test cross? Give its significance?

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

What is beanbag genetics? Explain.

What is monochromacy?

What is erythroblastosis foetalis?

What is hypophosphatemic rickets?

Differentiate between genotype and phenotype.

How does ABO incompatibility protect the developing baby against Rh-

What is contribution of Carl Correns in genetics?

Differentiate between autosome and sex chromosomes.

Differentiate between homogametic and heterogametic organism.

What is epistasis?Ho it differs from dominance?

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

Differentiate between genotype and phenotype.

What is nullo gametes?

What is beanbag genetics? Explain.

What is Bombay Phenotype?

What are jumping genes?

Explain gene and allele.

Define recombination frequency.Give an example.

What is test cross?Who devised it?

How sex is determined in plants?

Define polygenic Inheritance.Give example.

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

Compare between epistasis and poleiotropy.

What is tetrad?

What is Bombay Phenotype?

What is a true breeding variety?

Differentiate between population & gene pool.

What is epistasis?Ho it differs from dominance?

Define gene linkage and gene linkage groups.

What are jumping genes?