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

Question # 1

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 # 2

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 # 3

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 # 4

Define pleiotropy. Give two examples.

Ans 1: When a gene more than one trait it is called pleiotropy. For example gene for eye colour in Drosophila also controls shape of spermathecae.

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

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 # 7

What is law of segregation?

Ans 1: The two coexisting alleles for each trait in an individual segregate from each other at meiosis, so that each gamete has only one the two alleles.Alleles unite again random fertilization of gametes when zygote is formed.

Question # 8

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 # 9

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 # 10

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.

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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 Pleiotropy? Give one example.

Differentiate between gene and allele.

Differentiate between population & gene pool.

Define pleiotropy. Give two examples.

What are jumping genes?

Explain genic system for determination of sex.

What is law of segregation?

Differentiate between autosome and sex chromosomes.

Define linkage and give its one disadvantage.

How sex is determined in yeast?

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 Pleiotropy? Give one example.

Differentiate between gene and allele.

Differentiate between population & gene pool.

Define pleiotropy. Give two examples.

What are jumping genes?

Explain genic system for determination of sex.

What is law of segregation?

Differentiate between autosome and sex chromosomes.

Define linkage and give its one disadvantage.

How sex is determined in yeast?

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

What is a true breeding variety?

What is heterogametic individual?Give example.

Define gene linkage and gene linkage groups.

How sex is determined in yeast?

Define SRY gene.

Differentiate between monohybrid and dihybrid cross.

What is law of segregation?

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

How does ABO incompatibility protect the developing baby against Rh-

What is the product rule?

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

How does ABO incompatibility protect the developing baby against Rh-

In bird's the female is heterogametic. How?

Define probability.

Differentiate between dominant and recessive traits.

Differentiate between tritanopia and deutranopia.

What is the product rule?

Explain testicular feminization syndrome.

What is hypophosphatemic rickets?

What is test cross? Give its significance?

What is monochromacy?

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

What do you know about co-dominance?

Define pleiotropy. Give two examples.

Explain genic system for determination of sex.

Compare between epistasis and poleiotropy.

Define gene and locus.

What is tetrad?

What is nullo gametes?

What are multiple alleles,give its example?

Define recombination frequency.Give an example.

What is monochromacy?

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

How sex is determined in yeast?

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

Differentiate between population & gene pool.

Define linkage and give its one disadvantage.

Differentiate between genotype and phenotype.

What is Bombay Phenotype?

What are sex limited traits?Give an example.

Differentiate between dominant and recessive traits.