113 + Interview Questions in GENETICS IN GENERAL AWARENESS Page 3 InterviewSolution

101.	[A]: Cytoplasmic male sterility is observed in maize. [R]: The cytoplasmic male sterility ir, maize is due to interaction of cytoplasmic factors and male sterile geneA. If both A and R are true and R is the correct explanation of AB. If both A and R are true but R is not the correct explanation of AC. If A is true and R is falseD. If both A and R are false
Answer» Correct Answer - A

Discussion

102.

List any three features of garden pea with their dominant and recessive traits.

Answer»

Character	Dominant trait	Recessive trait
Flower Colour	Purple	White
Seed Colour	Yellow	Green
Seed Shape	Round	Wrinkled
Pod Shape	Inflated	Constricted
Flower Position	Axial	Termina

Discussion

103.	What is parental generation?
Answer» Generation of species which is used to produce progenies is called parental generation.

Discussion

104.	Explain why generally only the male child suffers from colour blindness and not the female?
Answer» Colour-blindness is caused due to recessive genes which occur on the X chromosome. Males have only one X chromosome. If there is recessive gene present on X chromosome, then the male will suffer from colour-blindness. Females have two X chromosomes. It is highly impossible that both the X chromosomes carry abnormal gene. Hence, if one gene is abnormal and since it is recessive, its expression will be masked by the normal gene present on the other X chromosome. Females are unlikely to suffer from colour-blindness.

104.

Explain why generally only the male child suffers from colour blindness and not the female?

Answer»

Colour-blindness is caused due to recessive genes which occur on the X chromosome.

Males have only one X chromosome. If there is recessive gene present on X chromosome, then the male will suffer from colour-blindness.

Females have two X chromosomes. It is highly impossible that both the X chromosomes carry abnormal gene. Hence, if one gene is abnormal and since it is recessive, its expression will be masked by the normal gene present on the other X chromosome. Females are unlikely to suffer from colour-blindness.

Discussion

105.	What do you understand by heterozygous?
Answer» When two forms in an allele for a trait are different the pair is called heterozygous, e.g. Tt or Yy.

Discussion

106.	In a certain species of animals, black fur (B) is dominant over brown fur (b) Show the possible ratio of genotypes and phenotypes of the offspring of the pure breeding different coloured parents.
Answer» Phenotypic Ratio - 3 (Black Fur) :1 (Brown Fur) Genotypic Ratio - 1(Homozygous Black Fur):2 (Heterozygous Black Fur): 1 (Homozygous Brown Fur)

106.

In a certain species of animals, black fur (B) is dominant over brown fur (b) Show the possible ratio of genotypes and phenotypes of the offspring of the pure breeding different coloured parents.

Answer»

Phenotypic Ratio - 3 (Black Fur) :1 (Brown Fur)

Genotypic Ratio - 1(Homozygous Black Fur):2 (Heterozygous Black Fur): 1 (Homozygous Brown Fur)

Discussion

107.	Explain the following terms:(a) heterozygous(b) Homozygous(c) pedigree chart.
Answer» (a) Heterozygous: The condition in which a pair of homologous chromosomes carries dissimilar alleles for a particular character. For example - (i) A daughter (XX^o) from a normal homozygous mother for colour vision (XX) and a colour blind father has one normal and one defective allele (X^oY). (ii) Certain tongue rollers are heterozygous with Rr genotype. (b) Homozygous: The condition in which a pair of homologous chromosomes carries similar alleles for a particular character. For example - (i) A colorblind daughter (X^oX^o) will have both the X chromosomes with defective alleles. (ii) A non-roller will have rr (homozygous) genotype. (c) Pedigree Chart: A pedigree chart is a diagram that shows the occurrence and appearance or phenotypes of a particular gene or organism and its ancestors from one generation to the next. In the pedigree chart, males are shown by squares and females by circles.

107.

Explain the following terms:(a) heterozygous(b) Homozygous(c) pedigree chart.

Answer»

(a) Heterozygous: The condition in which a pair of homologous chromosomes carries dissimilar alleles for a particular character.

For example -

(i) A daughter (XX^o) from a normal homozygous mother for colour vision (XX) and a colour blind father has one normal and one defective allele (X^oY).

(ii) Certain tongue rollers are heterozygous with Rr genotype.

(b) Homozygous: The condition in which a pair of homologous chromosomes carries similar alleles for a particular character.

For example -

(i) A colorblind daughter (X^oX^o) will have both the X chromosomes with defective alleles.

(ii) A non-roller will have rr (homozygous) genotype.

(c) Pedigree Chart: A pedigree chart is a diagram that shows the occurrence and appearance or phenotypes of a particular gene or organism and its ancestors from one generation to the next. In the pedigree chart, males are shown by squares and females by circles.

Discussion

108.	Match the terms in column I with their explanations in column II.Column I (Term)Column I (Explanation)a. genetics(i) Chromosomes similar in size and shapesb. Autosomes(ii) The alternative forms of a genec. Recessive gene(iii) Study of laws of inheritance of charactersd. Allele(iv) A gene that can express only when in a similar paire. Homologous chromosomes(v) Chromosomes other than the pair of sex chromosomes.
Answer» (a) - (iii) Study of laws of inheritance of characters (b) - (v) Chromosomes other than the pair of sex chromosomes (c) - (iv) A gene that can express when only in a similar pair (d) - (ii) The alternative forms of a gene (e) - (i) Chromosomes similar in size and shape

Discussion

109.	[A]: According to the theory of Lamarck use and disue caused the increase and de- crease in size of organs and environment caused the changes which can be trans- ferred to next generation. [R]: Modern synthetic theory is also known as Neo-Lamarckism.A. If both A and R are true and R is the correct explanation of AB. If both A and R are true but R is not the correct explanation of AC. If A is true and R is falseD. If both A and R are false
Answer» Correct Answer - C

Discussion

110.	Write the names of laws proposed by Mendel.
Answer» Following laws were proposed by Mendel: Law of dominance Law of segregation Law of independent assortment

110.

Write the names of laws proposed by Mendel.

Answer»

Following laws were proposed by Mendel:

Law of dominance
Law of segregation
Law of independent assortment

Discussion

111.	[A]: XXX females are called superfemales. [R]: They often give birth to triplets and qua- drupletsA. If both A and R are true and R is the correct explanation of AB. If both A and R are true but R is not the correct explanation of AC. If A is true and R is falseD. If both A and R are false
Answer» Correct Answer - C

Discussion

112.	[A]: Mimics are always or more often defenceless. [R]: Mimics are always less in number than the model individualsA. If both A and R are true and R is the correct explanation of AB. If both A and R are true but R is not the correct explanation of AC. If A is true and R is falseD. If both A and R are false
Answer» Correct Answer - B

Discussion

113.	[A]: It is not possible to take photograph and count chromosomes when they are highly coiled and condensed. [R]: Each species has a variable number of chromosomes.A. If both A and R are true and R is the correct explanation of AB. If both A and R are true but R is not the correct explanation of AC. If A is true and R is falseD. If both A and R are false
Answer» Correct Answer - D

Discussion

Explore topic-wise InterviewSolutions in .

List any three features of garden pea with their dominant and recessive traits.

What is parental generation?

Explain why generally only the male child suffers from colour blindness and not the female?

What do you understand by heterozygous?

In a certain species of animals, black fur (B) is dominant over brown fur (b) Show the possible ratio of genotypes and phenotypes of the offspring of the pure breeding different coloured parents.

Explain the following terms:(a) heterozygous(b) Homozygous(c) pedigree chart.

Write the names of laws proposed by Mendel.

[A]: XXX females are called superfemales. [R]: They often give birth to triplets and qua- drupletsA. If both A and R are true and R is the correct explanation of AB. If both A and R are true but R is not the correct explanation of AC. If A is true and R is falseD. If both A and R are false