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

Question # 1

Explain gene and allele.

Ans 1: Gene is a part a DNA which can provide instruction for the synthesis of a protein.It is unit of inheritance.
Ans 2: Allele is an alternate from of gene.

Question # 2

What is hypophosphatemic rickets?

Ans 1: It is an X linked dominant trait.It is rare hereditary disease.it does not result from vitamin D deficiency but its cause is a genetic communication failure at molecular level.The genes encoding bone proteins never receive vitamin D message to function.

Question # 3

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 # 4

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 # 5

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 # 6

What do you known about protanopia and tritanopia?

Ans 1: Protonopia is red colour blindness while tritonopia is blue color blindness.

Question # 7

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 # 8

Differentiate between homogametic and heterogametic organism.

Ans 1: Homogametic organism: When an organism produce all the gametes of same type it is called homogametic.
Ans 2: Heterogametic organism:If an organism produce gametes of different type it is called heterogametic.

Question # 9

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 # 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

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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 gene and allele.

What is hypophosphatemic rickets?

What is dominance?Discuss over dominance.

Differentiate between gene and allele.

Differentiate between linkage and linkage group.

What do you known about protanopia and tritanopia?

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

Differentiate between homogametic and heterogametic organism.

What are sex influenced traits?Give an example.

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

Explain gene and allele.

What is hypophosphatemic rickets?

What is dominance?Discuss over dominance.

Differentiate between gene and allele.

Differentiate between linkage and linkage group.

What do you known about protanopia and tritanopia?

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

Differentiate between homogametic and heterogametic organism.

What are sex influenced traits?Give an example.

What is beanbag genetics? Explain.

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

What is Pleiotropy? Give one example.

Differentiate between linkage and linkage group.

how can you calculate frequency between two linked genes?

How sex is determined in plants?

What is erythroblastosis foetalis?

Define crossing over.Give its importance.

Give significance of test cross.

Define recombination frequency.Give an example.

How does ABO incompatibility protect the developing baby against Rh-

What is monochromacy?

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

Define co-dominance.

What is law of segregation?

Differentiate between autosome and sex chromosomes.

Define pleiotropy. Give two examples.

how can you calculate frequency between two linked genes?

Differentiate between monohybrid and dihybrid cross.

Compare between epistasis and poleiotropy.

What is Mody?Write its causes.

Define SRY gene.

What is nullo gametes?

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

What is Pleiotropy? Give one example.

Give significance of test cross.

What is Mody?Write its causes.

Differentiate between genotype and phenotype.

What is the product rule?

Define gene linkage and gene linkage groups.

How does ABO incompatibility protect the developing baby against Rh-

How sex is determined in plants?

What is beanbag genetics? Explain.

Define linkage and give its one disadvantage.

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

Differentiate between linkage and linkage group.

Define incomplete dominance,Give example

What are multiple alleles,give its example?

Differentiate between continuous and discontinuous variations.

Give significance of test cross.

Define probability.

What is tetrad?

What is law of segregation?