List of top Plant Sciences Questions on Genetics asked in ICAR AIEEA (PG)

Arrange the following terms/events chronologically based on their birth/discovery from the oldest to the latest.
• [(A).] 'DNA double helix' discovery 
• [(B).] Coining of the term 'Gene' 
• [(C).] Coining of the term 'Genetics' 
• [(D).] Reporting of the 'Pure line theory' 
Choose the correct answer from the options given below: 
 

Given below are two statements, one is labelled as Assertion (A) and other labelled as Reason (R).
• [Assertion (A):] Incomplete penetrance and variable expressivity confuse the relationship between the genotype and phenotype. 
• [Reason (R):] Progeny test for more than one generation may be used to study the nature of penetrance and expressivity, and to establish the genotype of a plant beyond reasonable doubt. 
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 other labelled as Reason (R).
• [Assertion (A):] During DNA replication, the lagging strand is replicated in short pieces. 
• [Reason (R):] DNA polymerase can synthesize the DNA only in one direction i.e. 5' to 3'. 
In light of the above statements, choose the correct answer from the options given below. 
 

In a population in Hardy-Weinberg equilibrium, if the frequency of the homozygous dominant genotype (AA) is 0.64, what is the frequency of the dominant allele (A)?
Given below are two statements, one is labelled as Assertion (A) and other labelled as Reason (R).
Assertion (A): During meiosis, genetic recombination occurs which leads to genetic diversity among offspring.
Reason (R): Genetic recombination is facilitated by the crossing over of homologous chromosomes during prophase I of meiosis.
In light of the above statements, choose the most appropriate answer from the options given below.
Given below are two statements, one is labelled as Assertion (A) and other labelled as Reason (R).
Assertion (A): In field experiments, the word 'replication' means doing something again in exactly the same way or repeating the treatments.
Reason (R): The $F_2$ seeds can not be replicated in the field experiment as the genotype of each seed in an $F_2$ generation is not the same and hence can't be repeated.
In light of the above statements, choose the correct answer from the options given below.
Match List-I with List-II

List-I: Microorganism & List-II: Genetic principles established
(A). Streptococcus pneumoniae & (I). One gene-one enzyme
(B). Neurospora crassa & (II). RNA is the genetic material
(C). T4 Bacteriophage & (III). DNA is the genetic material
(D). TMV & (IV). Fine structure of gene
Choose the correct answer from the options given below:
Match List-I with List-II

List-I: Scientist & List-II: Discovery
(A). T.H. Morgan & (I). Chromosomal non-disjunction
(B). Calvin B Bridges & (II). Divisibility of gene in Drosophila
(C). Clarence P Oliver & (III). Deletion mapping
(D). Seymour Benzer & (IV). Chromosomal theory of inheritance
Choose the correct answer from the options given below:
Unlike Mendel's experiments, Bateson and Punnett's experiment with sweet peas demonstrated that, in the $F_2$ generation, genes for flower color and pollen length:
__________ is a second mutation that compensates for the effect of an original, first mutation. Choose the most appropriate option from the below-mentioned options to fill in the gap.
If an individual does not show a trait even though they have the appropriate genotype, the trait is said to exhibit
In humans, __________ traits are much easier to identify than __________ traits. Choose the correct pair of words from the options given below for filling in the blanks :
The formula: [Sum of (Observed-Expected)$^2$/Expected] is also known as
Given below are two statements, one is labelled as Assertion (A) and other one labelled as Reason (R).
Assertion (A) : Genetic recombination is an important mechanism of increasing genetic diversity in sexually reproducing organisms.
Reason (R) : Genetic recombination occurs during meiosis when homologous chromosomes exchange genetic material through crossing over, resulting in new combinations of alleles in the gametes.
In light of the above statements, choose the correct answer from the options given below.
Given below are two statements :
Statement (I) : Gregor Johann Mendel worked on Pisum sativum and established the laws of inheritance of traits.
Statement (II) : Gregor Johann Mendel also worked on mice, however, he had to abandon them due to pressure from the religious authority.
Match List-I with List-II

List-I (Particulars) & List-II (Formula used)
(A) Number of individuals in a perfect $F_2$ population & (III) $4^n$
(B) Number of perfect homozygous individuals in an $F_2$ population & (I) $2^n$
(C) Number of different heterozygous genotypes in an $F_2$ population & (IV) $3^n - 2^n$
(D) Number of different kinds of genotypes in an $F_2$ population & (II) $3^n$

Match List-I with List-II

List-I (Person product) & List-II (Description particulars)
(A) Louise Brown & (II) First IVF human baby
(B) Lulu Nana & (IV) First Genome-edited human baby
(C) Dolley & (III) First mammal cloned
(D) Flavr-Savr & (I) First Transgenic tomato

Match List-I with List-II

List-I (Particulars) & List-II (Nomenclature)
(A) An increase in the size of the triplet repeat & (I) Frameshift mutation
(B) A 5 bp deletion in an exon & (II) Transversion
(C) Substitution of one amino acid for another & (III) Expansion
(D) An A to a T point mutation & (IV) Missense mutation

If an autosomal recessive disorder, which shows Hardy-Weinberg equilibrium, has an incidence of 1 in 6400, then the frequency of a carrier is approximately -
The following genotypes are found in a population: AA/35, Aa/25, and aa/10. What are the allele frequencies of A and a ?
If the frequency of males affected with an X-linked recessive allele in a human population is 0.10 (1 in 10), what will be the expected frequency of affected females ?