List of top Plant Sciences Questions on Cytogenetics

Which of the following is a term for a plant or an embryo that contains only a gametic chromosome set:

Match List-I with List-II

List-I: Aneuploid & List-II: Genomic formula
(A). Nullisomic- Monosomic & (I). \((2n + 1) - (2n - 1)\)
(B). Double Monosomic & (II). \((2n - 1) - (2n + 1)\)
(C). Monosomic- Trisomic & (III). \((2n - 2) - (2n - 1)\)
(D). Trisomic- Monosomic & (IV). \(2n - 1 - 1\)
Choose the correct answer from the options given below:

__________ can occur in either the first or second meiotic division to produce abnormal gametes. Choose the correct word from the below-given option to fill in the gap.

Aneuploidy describes a numerical change in part of the genome, usually from the dosage of a single chromosome. If a chromosome or segment is overrepresented, it is called-

Arrange the following commercial crops in ascending order with respect to their ploidy level
(A). Wheat
(B). Cotton
(C). Tomato
(D). Banana
Choose the correct answer from the options given below:

Given below are two statements:
Statement (I): In usual terms, recombination frequency between any pair of genes does not exceed 50%.
Statement (II): In a situation of 4-strands double cross-over, recombination frequency becomes 100%.
In light of the above statements, choose the most appropriate answer from the options given below:

Choose the correct option for the chromosome number in ascending order in the following crops :
(A) Rice
(B) Pigeon pea
(C) Groundnut
(D) Wheat
Choose the correct answer from the options given below :

Match List-I with List-II

List-I (Chromosomal situation in human being) & List-II (Chromosome number)
(A) Monosomy & (I) 69
(B) Triploidy & (II) 48
(C) Tetraploidy & (III) 45
(D) Tetrasomy & (IV) 92

Two genes say A and B, are sex-linked genes in Drosophila melanogaster. Which of the following statements about the genes are correct ?
(A) A and B may be linked
(B) A and B may also have a 50% recombination frequency
(C) A and B are linked and can recombine only in males
(D) A and B are located in the same linkage group

Occurrence of unreduced gametes (i.e. 2n) has been reported in several crops including potatoes. Unreduced gametes can be produced by -
(A) First-division restitution
(B) Parallel spindle in the second meiotic division
(C) Second division restitution
(D) Occurrence of third meiotic division

Arrange the following parts of Wheat (Triticum aestivum L.) in descending order with respect to their chromosome number:
A. Endosperm
B. Male gamete
C. Embryo

Given below are two statements, one is labelled as Assertion A and the other is labelled as Reason R.
Assertion A: Meiosis is a reductional division
Reason R: In meiosis, the chromosome number is reduced from diploid to haploid
In light of the above statements, choose the correct answer from the options given below:

Match List I with List II
List I (Terminology):
A. Double monosomy
B. Trisomy
C. Nullisomy
D. Double tetrasomy
List II (Genetical formula):
I. 2N+2+2
II. 2N-2
III. 2N-1-1
IV. 2N+1
Choose the correct answer from the options given below:

In maize, the diploid chromosome number (2n) is 20. The number of chromosomes in endosperm cell (EC), pollen mother cell (PMC), pollen tube nucleus (PTN), and root tip cells (RTC) will be-
Choose the correct answer from the options given below:

The formation of a loop during the pachytene stage of meiosis indicates occurrence of -
A: Translocation
B: Deficiency
C: Inversion
D: Duplication
Choose the correct answer from the options given below:

Which of the following can be used for surface sterilization of plant material?

Given below are two statements, one is labelled as Assertion A and the other is labelled as Reason R
Assertion A : Rotation with legume crops can increase the nitrogen levels in the soil thus improving the soil fertility
Reason R : Legume crops harbor nitrogen fixing bacteria in the root nodules that can convert inert nitrogen from the atmosphere to plant usable form
In light of the above statements, choose the correct answer from the options given below

Given below are two statements, one is labelled as Assertion A and the other is labelled as Reason R.
Assertion A: Brassica juncea is an allotetraploid having AABB genome.
Reason R: Brassica juncea is produced when B. nigra is crossed to B. campestris.
In light of the above statements, choose the correct answer from the options given below.

Which of the following represents 'vertisol'

On average, how many fragments would a restriction enzyme, which recognizes a specific 5 base sequence in the DNA, would produce from a double-stranded bacteriophage genome of size 5252bp?

Given below are two statements:
Statement I: When one dominant allele of one gene and recessive allele of another gene are present on one chromosome and their opposite alleles are present on the homologous chromosome, the arrangement is called Cis-heterozygote.
Statement II: When the dominant alleles of two genes are present on one chromosome and their corresponding recessive alleles are present on the homologous chromosome, the arrangement is called Cis-heterozygote.
In the light of the above statements, choose the most appropriate answer from the options given below:

Rishitin is a phytoalexin produced by

Which among the following is the most popular cultivar of wheat in India?

Which of the following statements are correct regarding Mycoplasma?
A. They are the smallest free-living organisms
B. They lack a cell wall
C. They contain both DNA and RNA
D. They contain cellulose
Choose the correct answer from the options given below:

Given below are two statements:
Statement I: In bacterial transformation, a segment of naked DNA from the surroundings passes through the cell wall and plasma membrane of a recipient cell.
Statement II: Only a few competent recipient bacterial cells can take up the DNA from the surroundings.
In light of the above statements, choose the most appropriate answer from the options given below: