Question:
Given below are two statements:
Statement (I) : Mutagen induced male sterility is heritable and male sterility induced by gametocide is non-heritable.
Statement (II) : Heterozygous population derived in garden pea will not segregate on selfing.
In light of the above statements, choose the most appropriate answer from the options given below.
Given below are two statements:
Statement (I) : Mutagen induced male sterility is heritable and male sterility induced by gametocide is non-heritable.
Statement (II) : Heterozygous population derived in garden pea will not segregate on selfing.
In light of the above statements, choose the most appropriate answer from the options given below.
Statement (I) : Mutagen induced male sterility is heritable and male sterility induced by gametocide is non-heritable.
Statement (II) : Heterozygous population derived in garden pea will not segregate on selfing.
In light of the above statements, choose the most appropriate answer from the options given below.
Show Hint
Any heterozygous diploid population ($Aa$) in a self-pollinated crop like pea will always undergo segregation upon selfing, reducing heterozygosity by 50% in each subsequent generation.
Updated On: Jul 23, 2026
- Both Statement (I) and Statement (II) are true.
- Both Statement (I) and Statement (II) are false.
- Statement (I) is true but Statement (II) is false.
- Statement (I) is false but Statement (II) is true.
Show Solution
Verified By Collegedunia
The Correct Option is C
Solution and Explanation
Step 1: Understanding the Concept:
To evaluate these statements, we must analyze the genetic principles of male sterility induction and the segregation patterns of self-pollinated diploid crops.
Step 2: Detailed Explanation:
Let us analyze both statements individually:
- Statement (I) is true: Mutagens induce stable, structural changes in either the nuclear DNA (genetic male sterility, GMS) or mitochondrial DNA (cytoplasmic male sterility, CMS).
These genetic alterations are incorporated into the plant's genome and are passed down to subsequent generations according to Mendelian inheritance laws.
In contrast, chemical hybridizing agents (gametocides) act physiologically by temporarily disrupting pollen development in the treated generation only.
Because they do not alter the underlying DNA sequence, gametocide-induced male sterility is strictly non-heritable.
- Statement (II) is false: Garden pea (Pisum sativum) is a diploid, strictly self-pollinated crop.
If a population is heterozygous for a trait (e.g., genotype $Aa$), self-pollination (selfing) will result in standard Mendelian segregation in the $F_2$ generation.
The offspring will segregate in a $1:2:1$ genotypic ratio ($1\ AA : 2\ Aa : 1\ aa$) and a $3:1$ phenotypic ratio if the dominant allele is fully expressed.
Therefore, stating that a heterozygous pea population will not segregate upon selfing is genetically incorrect.
Thus, Statement (I) is true, but Statement (II) is false.
Step 3: Final Answer:
The correct option is: Statement (I) is true but Statement (II) is false.
To evaluate these statements, we must analyze the genetic principles of male sterility induction and the segregation patterns of self-pollinated diploid crops.
Step 2: Detailed Explanation:
Let us analyze both statements individually:
- Statement (I) is true: Mutagens induce stable, structural changes in either the nuclear DNA (genetic male sterility, GMS) or mitochondrial DNA (cytoplasmic male sterility, CMS).
These genetic alterations are incorporated into the plant's genome and are passed down to subsequent generations according to Mendelian inheritance laws.
In contrast, chemical hybridizing agents (gametocides) act physiologically by temporarily disrupting pollen development in the treated generation only.
Because they do not alter the underlying DNA sequence, gametocide-induced male sterility is strictly non-heritable.
- Statement (II) is false: Garden pea (Pisum sativum) is a diploid, strictly self-pollinated crop.
If a population is heterozygous for a trait (e.g., genotype $Aa$), self-pollination (selfing) will result in standard Mendelian segregation in the $F_2$ generation.
The offspring will segregate in a $1:2:1$ genotypic ratio ($1\ AA : 2\ Aa : 1\ aa$) and a $3:1$ phenotypic ratio if the dominant allele is fully expressed.
Therefore, stating that a heterozygous pea population will not segregate upon selfing is genetically incorrect.
Thus, Statement (I) is true, but Statement (II) is false.
Step 3: Final Answer:
The correct option is: Statement (I) is true but Statement (II) is false.
Was this answer helpful?
0
0
Top ICAR AIEEA Horticulture Questions
- In banana:
Statement (A): Bunch feeding is a simple and low-cost method.
Statement (B): It is the direct way to supply nutrients to the bunch.
Statement (C): Only micronutrients can be given through this method.
Choose the correct answer from the options given below. - The softwood grafting
Statement (I): Is done with mature, procured scion on the emerging soft, coppery-red shoot of the rootstock, which is 60-70 days old.
Statement (II): Is used for raising desired varieties of mango, sapota, tamarind and cashew.
In light of the above statements, choose the most appropriate answer from the options given below. - Given below are two statements:
Statement (I): In garlic modified roots are economic part.
Statement (II): Characteristic odour in garlic is due to volatile organic sulfur-containing compounds that are rapidly produced upon tissue damage and diffuse into the air.
In light of the above statements, choose the most appropriate answer from the options given below. - Given below are two statements:
Statement (I): The flowers of ridge gourd start opening in the evening and remain open throughout the night.
Statement (II): Pollination of ridge gourd is done in the day time.
In light of the above statements, choose the most appropriate answer from the options given below. - Given below are two statements:
Statement (I): The first gynoecious based hybrid of bitter gourd is Pusa Hybrid-4 developed by ICAR-IARI, New Delhi.
Statement (II): The male:female ratio of the gynoecious based hybrids of bitter gourd is 25:1.
In light of the above statements, choose the most appropriate answer from the options given below.
View More Questions
Top ICAR AIEEA Genetics & Plant Breeding Questions
- Which one of the following is not a Spanish bunch variety of ground nut?
- Which is world first semi dwarf, photoperiod insensitive and high yielding rice variety?
- Given below are two statements:
Statement (I): Bringing together two or more genes governing a single trait, especially resistance to disease is known as gene pyramiding
Statement II: The use of molecular markers greatly facilitates gene pyramiding as it minimises the need for disease tests and progeny test
In light of the above statements, choose the most appropriate answer from the options given below: - Polyploidy level of cultivated strawberry
- Mango hybrid Arka Suprabhath is a croos between
View More Questions
Top ICAR AIEEA Questions
- Which of the following statements is false?
- Which of the following is an example of an inventory?
- According to Adam Smith, productivity gains could be brought about through .
- The supply curve for an artificially scarce good is .
- Which of the following would not be considered an opportunity cost of paid employment?
View More Questions